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Some combinatorial identities of the r-Whitney-Eulerian numbers


Mansour Toufik, Ramírez José L., Shattuck Mark*, Villamaríín Sergio N.

Source title: 
Applicable Analysis and Discrete Mathematics, 13(2): 378-398, 2019 (ISI)
Academic year of acceptance: 

In this paper, we study further properties of a recently introduced generalized Eulerian number, denoted by Am,r(n, k), which reduces to the classical Eulerian number when m = 1 and r = 0. Among our results is a generalization of an earlier symmetric Eulerian number identity of Chung, Graham and Knuth. Using the row generating function for Am,r(n, k) for a fixed n, we introduce the r-Whitney-Euler-Frobenius fractions, which generalize the Euler-Frobenius fractions. Finally, we consider a further four-parameter combinatorial generalization of Am,r(n, k) and find a formula for its exponential generating function in terms of the Lambert-W function.