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A009423 Expansion of log(1+x)*log(1+tanh(x)). 1

%I #15 Jun 23 2015 21:42:13

%S 0,0,2,-6,14,-40,204,-1316,8728,-65472,587520,-5909024,63996096,

%T -755614080,9771577984,-136347987712,2032096826880,-32315254874112,

%U 547193693896704,-9816654494863360,185846783267553280,-3704632705419493376

%N Expansion of log(1+x)*log(1+tanh(x)).

%F a(n) ~ (n-1)! * (-1)^n * log((1+exp(2))/2). - _Vaclav Kotesovec_, Jan 23 2015

%t Log[ 1+x ]*Log[ 1+Tanh[ x ] ]

%t CoefficientList[Series[Log[1 + x]*Log[1 + Tanh[x]], {x, 0, 20}], x] * Range[0, 20]! (* _Vaclav Kotesovec_, Jan 23 2015 *)

%K sign,easy

%O 0,3

%A _R. H. Hardin_

%E Extended with signs by _Olivier GĂ©rard_, Mar 15 1997

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Last modified March 29 06:57 EDT 2024. Contains 371265 sequences. (Running on oeis4.)