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A009392 Expansion of e.g.f.: log(1+tanh(x))/cosh(x). 1

%I

%S 0,1,-1,-3,8,25,-121,-427,3128,12465,-124921,-555731,7158128,35135945,

%T -557749921,-2990414715,56767019408,329655706465,-7316056402321,

%U -45692713833379,1164842760597368,7777794952988025,-224574978081433321

%N Expansion of e.g.f.: log(1+tanh(x))/cosh(x).

%t With[{nn=30},CoefficientList[Series[Log[1+Tanh[x]]/Cosh[x],{x,0,nn}],x] Range[ 0,nn]!] (* _Harvey P. Dale_, Oct 06 2014 *)

%K sign,easy

%O 0,4

%A _R. H. Hardin_

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

%E Definition clarified and prior Mathematica program replaced by _Harvey P. Dale_, Oct 06 2014

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Last modified October 28 04:43 EDT 2021. Contains 348313 sequences. (Running on oeis4.)