Enumeration formulas for generalized q-Euler numbers

Details Enumeration formulas for generalized q-Euler numbers Enumeration formulas for generalized q-Euler numbers

2011-04-23

arxiv.org/abs/1104.4584v2

Mathematics

Combinatorics

20 pages, 12 figures

Scientific paper

We find an enumeration formula for a $(t,q)$-Euler number which is a generalization of the $q$-Euler number introduced by Han, Randrianarivony, and Zeng. We also give a combinatorial expression for the $(t,q)$-Euler number and find another formula when $t=\pm q^r$ for any integer $r$. Special cases of our latter formula include the formula of the $q$-Euler number recently found by Josuat-Verg\`es and Touchard-Riordan's formula.

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