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A009358
Expansion of log(1+sinh(x)*cosh(x)).
1
0, 1, -1, 6, -22, 120, -856, 7056, -68272, 758400, -9452416, 130918656, -1995427072, 33173038080, -597434776576, 11587651270656, -240801628444672, 5337660866396160, -125710803524878336, 3134856182239789056
OFFSET
0,4
LINKS
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
KEYWORD
sign,easy
AUTHOR
EXTENSIONS
Extended with signs by Olivier Gérard, Mar 15 1997
STATUS
approved