A009226 Expansion of e.g.f.: exp(sinh(x))/cosh(x).

1, 1, 0, -1, 4, 17, -24, -201, 848, 7041, -25792, -291025, 1491392, 18979729, -106879616, -1597285977, 10504954112, 176766161281, -1298259085312, -24470008076193, 200164547589120, 4166922390589073, -37466482286032896

Offset

0,5

Links

Table of n, a(n) for n=0..22.

Mathematica

With[{nn=30}, CoefficientList[Series[Exp[Sinh[x]]/Cosh[x], {x, 0, nn}], x]Range[0, nn]!] (* Harvey P. Dale, Sep 23 2012 *)

Crossrefs

Sequence in context: A042033 A281464 A192197 * A273022 A273119 A302618

Adjacent sequences: A009223 A009224 A009225 * A009227 A009228 A009229

Keyword

sign,easy

Author

R. H. Hardin

Extensions

Extended with signs by Olivier Gérard, Mar 15 1997

Definition clarified by Harvey P. Dale, Sep 23 2012

Status

approved