A009296 Expansion of exp(x)/cosh(sinh(x)).

1, 1, 0, -2, -4, -4, 24, 176, 272, -1712, -14528, -66912, 181312, 4737344, 20265088, -53926656, -1771263744, -18559434496, 4388386816, 1869838374400, 16325400792064, 35429689535488, -1796402984175616, -36301265658269696

Offset

0,4

Links

Table of n, a(n) for n=0..23.

Mathematica

With[{nn=30}, CoefficientList[Series[Exp[x]/Cosh[Sinh[x]], {x, 0, nn}], x] Range[0, nn]!] (* Harvey P. Dale, Sep 18 2011 *)

Crossrefs

Sequence in context: A103973 A322635 A129826 * A068554 A371373 A092524

Adjacent sequences: A009293 A009294 A009295 * A009297 A009298 A009299

Keyword

sign,easy

Author

R. H. Hardin

Extensions

Extended with signs by Olivier Gérard, Mar 15 1997

Status

approved