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Expansion of exp(x)/cosh(tan(x)).
2

%I #19 Apr 09 2014 04:27:15

%S 1,1,0,-2,-8,-24,-56,-104,512,5824,54912,385408,2590336,15920256,

%T 69311488,160063744,-3936710656,-67251703808,-914002857984,

%U -9821117788160,-81770855727104,-551206277726208,2175764106870784,106679023552528384

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

%H Vincenzo Librandi, <a href="/A009297/b009297.txt">Table of n, a(n) for n = 0..200</a>

%t With[{nn=30},CoefficientList[Series[Exp[x]/Cosh[Tan[x]],{x,0,nn}], x]Range[0,nn]!] (* _Harvey P. Dale_, Apr 22 2012 *)

%Y Cf. A009107.

%K sign,easy

%O 0,4

%A _R. H. Hardin_

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