A (p, q)-Analogue of the r-Whitney-Lah Numbers
José L. Ramírez
Departamento de Matemáticas
Universidad Sergio Arboleda
110221 Bogotá
Colombia
Mark Shattuck
Department of Mathematics
University of Tennessee
Knoxville, TN 37996
USA
Abstract:
In this paper, we consider a (p, q)-generalization of the r-Whitney-Lah
numbers that reduces to these recently introduced numbers when p = q =
1. We develop a combinatorial interpretation for our generalized
numbers in terms of a pair of statistics on an extension of the set of
r-Lah distributions wherein certain elements are assigned a color. We
obtain generalizations of some earlier results for the r-Whitney-Lah
sequence, including explicit formulas and various recurrences, as well
as ascertain some new results for this sequence. We provide
combinatorial proofs of some additional formulas in the case when q =
1, among them one that generalizes an identity expressing the
r-Whitney-Lah numbers in terms of the r-Lah numbers. Finally, we
introduce the (p, q)-Whitney-Lah matrix and study some of its
properties.
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(Concerned with sequences
A008297
A143497.)
Received January 16 2016; revised version received May 24 2016.
Published in Journal of Integer Sequences, June 3 2016.
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