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A009161 Expansion of cosh(tan(x))/exp(x). 1

%I #15 Apr 09 2014 04:27:26

%S 1,-1,2,-4,16,-56,328,-1576,11712,-70912,638720,-4668544,49459840,

%T -423673472,5159926528,-50674728448,697030680576,-7717401038848,

%U 118233272496128,-1456461190426624,24578235697610752,-333308651379949568

%N Expansion of cosh(tan(x))/exp(x).

%H Vincenzo Librandi, <a href="/A009161/b009161.txt">Table of n, a(n) for n = 0..200</a>

%t With[{nn=30},CoefficientList[Series[Cosh[Tan[x]]/Exp[x],{x,0,nn}],x] Range[ 0,nn]!] (* _Harvey P. Dale_, Apr 08 2014 *)

%K sign,easy

%O 0,3

%A _R. H. Hardin_

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

%E Mathematica program replaced by _Harvey P. Dale_, Apr 08 2014

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Last modified July 21 06:08 EDT 2024. Contains 374463 sequences. (Running on oeis4.)