On the descent numbers and major indices for the hyperoctahedral group" (with Chak-On Chow), Adv. in Appl. Math. 38 (2007) 275–301
pdf file.
A refinement of Cayley's formula for trees (with Seunghyun Seo),
Electronic J. Combinatorics 11, no. 2 (2004–2006), R27.
Link to E-JC
The generating function of ternary trees and continued fractions
(with Guoce Xin),Electronic J. Combinatorics 13, no. 1 (2006), R53.
Link to E-JC
Symmetric inclusion-exclusion, Séminaire Lotharingien de Combinatorie 54 (2005), B54b.
Link to SLC
A short proof of the Zeilberger-Bressoud q-Dyson theorem (with Guoce Xin), Proc. Amer. Math. Soc., to be published. arXiv:math.CO/0412339.
A combinatorial interpretation of the numbers 6(2n)! /n! (n+2)! (with Guoce Xin),
J. Integer Seq. 8 (2005), no. 2, Article 05.2.3,
13 pp.
Link to JIS
Hypergraphs and a functional equation of Bouwkamp and de Bruijn
(with Louis H. Kalikow)
J. Combinatorial Theory, Ser. A 110 (2005), 275–289.
pdf file
On Miki's identity for Bernoulli numbers,
J. Number Theory, 110 (2005), 75–82.
pdf file
Signed Mahonians (with Ron M. Adin and Yuval Roichman),
J. Combin. Theory Ser. A 109 (2005), 25–43.
pdf file
Slides from a talk on Rational functions with nonnegative power series coefficients, 50th Seminaire Lotharingien de Combinatoire, March 25, 2003.
pdf file
Applications of the classical umbral
calculus
Algebra Universalis 49 (2003), 397–434.
dvi file
pdf file
The polynomial part of a restricted partition function
related to the Frobenius problem
(with Matthias Beck and Takao Komatsu)
Electronic J. Combinatorics
8 (2001), No. 1, N7 (5 pages).
dvi file
pdf file
Link to E-JC
The specification of 2-trees
(with Tom Fowler, Gilbert Labelle, and Pierre Leroux),
Advances in Applied Math. 28 (2002), 145–168.
pdf file
gzipped postscript file
Acyclic orientations and chromatic generating functions,
Discrete Math. 232 (2001), 119–130.
dvi file
pdf file
gzipped postscript file
On the order of Stirling numbers and
alternating binomial coefficient sums
(with Tamas Lengyel), Fibonacci Quarterly,
39 (2001), 444–454.
pdf file
The Smith College diploma problem,
Amer. Math. Monthly 108 (2001), 55–57.
dvi file
pdf file
gzipped postscript file
On the number of convex polyominoes,
Annales des Sciences Mathemathiques
du Quebec, 24 (2000), 63–66.
dvi file
pdf file
gzipped postscript file
Tilings of diamonds and hexagons with defects
(with Harald Helfgott),Electronic J. Combinatorics 6, No. 1
(1999), R16 (21 pages).
gzipped postscript file
pdf file
Wolstenholme revisited
Amer. Math. Monthly 105 (1998), 657–658.
pdf file
Lattice walks in Zd and permutations with no long
ascending subsequences (with Jonathan Weinstein and Herbert S. Wilf),
Electronic J. Combinatorics 5, No. 1 (1998), R2 (11 pages).
Link to EJC
Lattice paths and Faber polynomials (with Sangwook Ree),
in
Advances in Combinatorial Methods and Applications to
Probability and Statistics, ed. N. Balakrishnan, Birkhauser Boston, 1997,
pp. 3–13.
dvi file
pdf file
AMSTeX file
Cylindric partitions (with C. Krattenthaler), Trans. Amer. Math.
Soc. 349 (1997), 429–479.
Link to TAMS
Generating functions and generalized Dedekind sums,
Electronic J. Combinatorics 4, No. 2, Wilf Festschrift
(1997), R11 (17 pages).
Link to EJC
Even and odd pairs of lattice paths with multiple intersections
(with Walter Shur), J. Combin. Theory Ser. A 75 (1996),
243–253.
gzipped postscript file
pdf file
Counting pairs of lattice paths by intersections
(with Wayne Goddard, Walter Shur, Herbert S. Wilf, and Lily Yen), J. Combin. Theory Ser. A
74 (1996), 173–187.
gzipped postscript file
The Tutte polynomial of a graph, depth-first search, and simplicial complex partitions
(with Bruce Sagan), Electronic J. Combinatorics
3, No. 2, Foata Festschrift (1996), R9 (36 pages).
Link to EJC
Counting forests by descents and leaves, Electronic J. Combinatorics
3, No. 2, Foata Festschrift (1996), R8 (5 pages).
Link to EJC
Counting acyclic digraphs by sources and sinks,
Discrete Math. 160 (1996), 253–258.
pdf file
AMSTeX file
Enumerative applications of a decomposition for graphs and
digraphs,
Discrete Math.
139 (1995), 257–271.
pdf file
Algebraic enumeration (with R. P. Stanley), in
Handbook of
Combinatorics ed. R. L. Graham, M. Grotschel, and L. Lovasz,
Elsevier and MIT Press, 1995, pp. 1021–1062.
pdf file
Finding identities with the WZ method.,
J. Symbolic
Comput. 20 (1995), 537–566.
pdf file
Counting paths in Young's lattice,
J. Statistical Planning and
Inference 34 (1993), 125–134.
pdf file
dvi file
Super ballot numbers,
J. Symbolic Computation 14 (1992),
179–194.
pdf file
dvi file
gzipped postscript file
A coloring problem,
Amer. Math. Monthly 98 (1991),
530–533.
pdf file
Symmetric functions and P-recursiveness,
J. Combin. Theory Ser. A 53
(1990), 257–285.
pdf file
Generalized rook polynomials and orthogonal polynomials, in
q-Series and Partitions, ed. D. Stanton, The IMA Volumes in
Mathematics and Its Applications, Vol. 18, Springer-Verlag, New York, 1989,
pp. 159–176.
pdf file
Determinants, paths, and plane partitions
(with X. G. Viennot), preprint, 1989
pdf file
dvi file
Enumerative applications of symmetric functions,
Séminaire Lotharingien de Combinatoire B17a (1987), 17 pp.
Link to SLC
Counting three-line Latin rectangles, in
Combinatoire
énumerative, ed. G. Labelle and P. Leroux, Lecture Notes in
Mathematics, Vol. 1234, Springer-Verlag, 1986, pp. 106–111.
pdf file