A009385 E.g.f. log(1 + tanh(sinh(x))).

0, 1, -1, 1, -2, 1, 8, 1, -16, 1, -2304, 1, 68352, 1, 843776, 1, -221382656, 1, 9865887744, 1, 888186732544, 1, -200433787207680, 1, 8060855544971264, 1, 3814697273321848832, 1, -890946236332166348800, 1, -9668703713250158575616

Offset

0,5

Links

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

Mathematica

With[{nn=30}, CoefficientList[Series[Log[1+Tanh[Sinh[x]]], {x, 0, nn}], x]Range[0, nn]!] (* Harvey P. Dale, Mar 01 2012 *)

Crossrefs

Sequence in context: A371650 A369779 A125911 * A008308 A176889 A208753

Adjacent sequences: A009382 A009383 A009384 * A009386 A009387 A009388

Keyword

sign,easy

Author

R. H. Hardin

Extensions

Extended with signs by Olivier Gérard, Mar 15 1997

Status

approved