A009358 Expansion of log(1+sinh(x)*cosh(x)).

0, 1, -1, 6, -22, 120, -856, 7056, -68272, 758400, -9452416, 130918656, -1995427072, 33173038080, -597434776576, 11587651270656, -240801628444672, 5337660866396160, -125710803524878336, 3134856182239789056

Offset

0,4

Links

Harvey P. Dale, Table of n, a(n) for n = 0..500

Formula

a(n) ~ (n-1)! * (-1)^(n+1) * (2/log(2+sqrt(5)))^n. - Vaclav Kotesovec, Jan 23 2015

Mathematica

With[{nn=20}, CoefficientList[Series[Log[1+Sinh[x]* Cosh[x]], {x, 0, nn}], x]Range[0, nn]!] (* Harvey P. Dale, Sep 30 2011 *)

Crossrefs

Sequence in context: A151495 A193463 A319214 * A213130 A002137 A009361

Adjacent sequences: A009355 A009356 A009357 * A009359 A009360 A009361

Keyword

sign,easy

Author

R. H. Hardin

Extensions

Extended with signs by Olivier Gérard, Mar 15 1997

Status

approved