A009234 Expansion of e.g.f.: exp(sinh(x)/cos(x)).

1, 1, 1, 5, 17, 77, 457, 2641, 19777, 149529, 1305489, 12183613, 122670033, 1342074021, 15462740633, 192192501897, 2502900454401, 34713417890609, 504155298072609, 7713202738776565, 123438576028985873

Offset: 0

Author

R. H. Hardin

Keywords

• nonn
• easy

Links

• Vincenzo Librandi, Table of n, a(n) for n = 0..200

Programs

Mathematica

With[{nn=20},CoefficientList[Series[Exp[Sinh[x]/Cos[x]],{x,0,nn}],x] Range[0,nn]!] (* Harvey P. Dale, Dec 07 2013 *)

Extensions

Extended and signs tested by Olivier Gérard, Mar 15 1997

Definition clarified and prior Mathematica program replaced by Harvey P. Dale, Dec 07 2013