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sec(arcsinh(x)+arctan(x))=1+4/2!*x^2+56/4!*x^4+1990/6!*x^6...
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%I #6 Dec 05 2024 15:12:07

%S 1,4,56,1990,130280,13814650,2137954100,457685029750,128915903246000,

%T 46370152422675250,20689120752785127500,11232151174947132868750,

%U 7281395066161326989645000,5560840304175437693730906250

%N sec(arcsinh(x)+arctan(x))=1+4/2!*x^2+56/4!*x^4+1990/6!*x^6...

%t With[{nn=30},Take[CoefficientList[Series[Sec[ArcSinh[x]+ArcTan[x]],{x,0,nn}],x] Range[0,nn]!,{1,-1,2}]] (* _Harvey P. Dale_, Dec 05 2024 *)

%K nonn

%O 0,2

%A Patrick Demichel (patrick.demichel(AT)hp.com)