A009274 E.g.f.: exp(tanh(x)/cos(x)).

1, 1, 1, 2, 5, 32, 157, 688, 3817, 29952, 257049, 1922560, 15886125, 160364544, 1844058101, 19815696384, 218349214545, 2743045259264, 38729647296945, 538516252917760, 7468216325125589, 112957538226929664, 1882371895493492429

Offset: 0

Author

R. H. Hardin

Keywords

• nonn

Programs

Mathematica

With[{nn=30},CoefficientList[Series[Exp[Tanh[x]/Cos[x]],{x,0,nn}],x] Range[0,nn]!] (* Harvey P. Dale, Aug 25 2012 *)

PARI

for(n=1,#t=Vec(exp(tanh(x)/cos(x))),print1((n-1)!*t[n]",")) \\ - M. F. Hasler, Aug 25 2012

Extensions

Extended and formatted by Olivier Gérard, Mar 15 1997

Definition clarified by Harvey P. Dale, Aug 25 2012