Electronic J. Combin. Vol. 18 (2) (May 13, 2011)
(The Zeilberger Festschrift), P7, 16 p.
Dominique Foata and Guo-Niu Han
THE (t,q)-ANALOGS OF SECANT AND TANGENT NUMBERS
Abstract.
The secant and tangent numbers are given
(t,q)-analogs with an explicit combinatorial interpretation.
This extends, both analytically and combinatorially, the
classical evaluations of the Eulerian and Roselle polynomials
at t=-1.
foata at unistra dot fr,
guoniu dot han at unistra dot fr
The following version is available: