A009268 Expansion of e.g.f. exp(tanh(x)*exp(x)).

1, 1, 3, 8, 25, 92, 369, 1626, 8033, 42312, 230081, 1354190, 8806769, 59072860, 398252833, 2892141666, 22862362049, 182200364944, 1492258801793, 13163090657814, 111357664397265, 938233188787748, 11338336523834337

Offset: 0

Author

R. H. Hardin

Keywords

• sign
• easy

Links

• Andrew Howroyd, Table of n, a(n) for n = 0..200

Programs

Mathematica

With[{nn=30},CoefficientList[Series[Exp[Tanh[x]Exp[x]],{x,0,nn}],x] Range[0,nn]!] (* Harvey P. Dale, May 31 2012 *)

PARI

seq(n)={my(x='x+O('x^n)); Vec(serlaplace(exp(tanh(x)*exp(x))))} \\ Andrew Howroyd, Feb 25 2018

Extensions

Extended with signs by Olivier Gérard, Mar 15 1997