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%I #6 Sep 16 2016 17:55:35
%S 1,-1,1,47,-447,-31649,1241153,94750991,-10593064063,-734072274241,
%T 217167723689345,9078987118530031,-9048136095510326335,
%U 132977311200029875999,677245929952843206843329
%N sech(tan(sin(x)))=1-1/2!*x^2+1/4!*x^4+47/6!*x^6-447/8!*x^8...
%t With[{nn=30},Take[CoefficientList[Series[Sech[Tan[Sin[x]]],{x,0,nn}],x] Range[0,nn]!,{1,-1,2}]] (* _Harvey P. Dale_, Sep 16 2016 *)
%K sign
%O 0,4
%A Patrick Demichel (patrick.demichel(AT)hp.com)
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