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%I #6 Jan 17 2024 14:50:05
%S 1,4,48,1344,71680,6134144,766639104,132845576192,30189756186624,
%T 8791995173601280,3164834039610834944,1391075516277863612416,
%U 727593505575051704926208,449845963881833812549697536
%N sec(tanh(x)+arctan(x))=1+4/2!*x^2+48/4!*x^4+1344/6!*x^6+71680/8!*x^8...
%t With[{nn=30},Take[CoefficientList[Series[Sec[Tanh[x]+ArcTan[x]],{x,0,nn}],x] Range[0,nn]!,{1,-1,2}]] (* _Harvey P. Dale_, Jan 17 2024 *)
%K nonn
%O 0,2
%A Patrick Demichel (patrick.demichel(AT)hp.com)
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