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%I
%S 1,-1,9,-249,13297,-1175761,154625721,-28328562313,6890453792609,
%T -2147692998841633,834418870682339561,-395288520944694504345,
%U 224249503561141591847505,-150078278389547160573482225
%N sech(arcsin(arctan(x)))=1-1/2!*x^2+9/4!*x^4-249/6!*x^6+13297/8!*x^8...
%t With[{nn=30},Take[CoefficientList[Series[Sech[ArcSin[ArcTan[x]]],{x,0,nn}],x] Range[0,nn]!,{1,-1,2}]] (* _Harvey P. Dale_, Oct 26 2019 *)
%K sign
%O 0,3
%A Patrick Demichel (patrick.demichel(AT)hp.com)
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