%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
