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A013191
Expansion of e.g.f. log(cosh(x) + tanh(x)).
0
0, 1, 0, -3, 12, -15, -120, 1197, -6048, -255, 428160, -5448003, 29812992, 241437105, -8332047360, 104019879597, -293043130368, -17849464279935, 456591699640320, -5108933510880003, -26996975653552128
OFFSET
0,4
EXAMPLE
x - 3/3!*x^3 + 12/4!*x^4 - 15/5!*x^5 - 120/6!*x^6 ...
MATHEMATICA
With[{nn=20}, CoefficientList[Series[Log[Cosh[x]+Tanh[x]], {x, 0, nn}], x] Range[0, nn]!] (* Harvey P. Dale, Jun 20 2021 *)
CROSSREFS
Sequence in context: A330941 A361925 A096854 * A332959 A009783 A341013
KEYWORD
sign
AUTHOR
Patrick Demichel (patrick.demichel(AT)hp.com)
EXTENSIONS
a(0)=0 inserted and title improved by Sean A. Irvine, Aug 01 2018
STATUS
approved