A Note on Combinatorial Proofs for Extended Touchard's and Extended Koshy's Identities

Roberta R. Zhou, Kun Yan, Yihui He, Xinxin Xu. A Note on Combinatorial Proofs for Extended Touchard's and Extended Koshy's Identities. Graphs and Combinatorics, 36(6):1705-1711, 2020. [doi]

Abstract

Abstract is missing.