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%I #6 Jun 22 2022 15:35:25
%S 1,1,17,769,66849,9506241,2007271089,589807203777,230194642564161,
%T 115219444193968257,71962921603647030609,54865853223458268869505,
%U 50151129904368572197783905,54139213630083955379966633025
%N sec(arcsin(arctanh(x)))=1+1/2!*x^2+17/4!*x^4+769/6!*x^6+66849/8!*x^8...
%t With[{nn=30},Take[CoefficientList[Series[Sec[ArcSin[ArcTanh[x]]],{x,0,nn}],x] Range[ 0,nn]!,{1,-1,2}]] (* _Harvey P. Dale_, Jun 22 2022 *)
%K nonn
%O 0,3
%A Patrick Demichel (patrick.demichel(AT)hp.com)
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