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A012098 sech(arcsin(arctan(x)))=1-1/2!*x^2+9/4!*x^4-249/6!*x^6+13297/8!*x^8... 0

%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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Last modified August 12 20:18 EDT 2022. Contains 356077 sequences. (Running on oeis4.)