##### Séminaire Lotharingien de Combinatoire, B73e (2016), 54 pp.

# Dominique Foata, Guo-Niu Han

#
ANDRE PERMUTATION CALCULUS: A TWIN SEIDEL SEQUENCE

**Abstract.**
Entringer numbers occur in the André permutation combinatorial set-up under several forms. This leads to the construction of a matrix refinement of the tangent (respectively secant) numbers. Furthermore, closed expressions for the three-variate exponential generating functions for pairs of so-called Entringerian statistics are derived.

foata at unistra dot fr,
guoniu dot han at unistra dot fr

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