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 A009186 Expansion of e.g.f.: cosh(x)/exp(tan(x)). 1

%I #15 May 21 2012 06:30:06

%S 1,-1,2,-6,16,-72,328,-1848,11712,-81088,638720,-5318016,49459840,

%T -483162240,5159926528,-57865303296,697030680576,-8815813734400,

%U 118233272496128,-1662921003208704,24578235697610752,-380141599264751616,6139851821419921408

%N Expansion of e.g.f.: cosh(x)/exp(tan(x)).

%H Vincenzo Librandi, <a href="/A009186/b009186.txt">Table of n, a(n) for n = 0..200</a>

%p a:= n-> n! * coeff (series (cosh(x)/exp(tan(x)), x, n+1), x, n):

%p seq (a(n), n=0..30); # _Alois P. Heinz_, May 16 2012

%t With[{nn=30},CoefficientList[Series[Cosh[x]/Exp[Tan[x]],{x,0,nn}],x] Range[0,nn]!] _Harvey P. Dale_, May 16 2012

%K sign,easy

%O 0,3

%A _R. H. Hardin_

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

%E Definition clarified by _Harvey P. Dale_, May 16 2012

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Last modified June 12 14:23 EDT 2024. Contains 373331 sequences. (Running on oeis4.)