A reciprocity theorem for domino tilings.
A recurrence relation for the “inv" analogue of -Eulerian polynomials.
A recursive relation for weighted Motzkin sequences.
A refinement of a partition theorem of Sellers.
A refinement of Cayley's formula for trees.
A refinement of the formula for -ary trees and the Gould-Vandermonde's convolution.
A relation between restricted and unrestricted weighted Motzkin paths.
A relationship between the major index for tableaux and the charge statistic for permutations.
A Remark On Filter Regularity
A remark on filter regularity.
A representation of Sheffer polynomials in terms of a differential equation for their generating functions.
A representation of Sheffer polynomials in terms of a differential equation for their generating functions. (Short Communication).
A restricted random walk defined via a Fibonacci process.
A Riordan array proof of a curious identity.
A Schröder generalization of Haglund's statistic on Catalan paths.
A Sequence of Exponential Numbers
A series transformation formula and related polynomials.
A sextuple product identity with applications.
A sharp bound for the reconstruction of partitions.
A sharp inequality involving the psi function.