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A009435 Expansion of e.g.f.: log(1+x)/cosh(x). 3

%I

%S 0,1,-1,-1,0,29,-105,139,-2072,31737,-247545,1824151,-22456104,

%T 313750293,-3929185169,51584719523,-793292190480,13137192234225,

%U -221862616530705,3947317975733039,-75492532592047280,1522475446731094285

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

%F a(n) ~ (-1)^(n+1) * (n-1)! / cosh(1). - _Vaclav Kotesovec_, Oct 01 2014

%t With[{nn=30},CoefficientList[Series[Log[1+x]/Cosh[x],{x,0,nn}],x] Range[ 0,nn]!] (* _Harvey P. Dale_, Oct 01 2014 *)

%K sign,easy

%O 0,6

%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 01 2014

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Last modified March 27 12:57 EDT 2023. Contains 361570 sequences. (Running on oeis4.)