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A013179 cos(arctanh(x)+arctan(x))=1-4/2!*x^2+16/4!*x^4-640/6!*x^6+21760/8!*x^8... 0

%I

%S 1,-4,16,-640,21760,-2291200,223436800,-44438118400,8725110784000,

%T -2796896567296000,926039081943040000,-435519369139978240000,

%U 218626979887002419200000,-141711151230417633280000000

%N cos(arctanh(x)+arctan(x))=1-4/2!*x^2+16/4!*x^4-640/6!*x^6+21760/8!*x^8...

%t With[{nn=30},Take[CoefficientList[Series[Cos[ArcTanh[x]+ArcTan[x]],{x,0,nn}],x] Range[0,nn]!,{1,-1,2}]] (* _Ray Chandler_, Nov 29 2016 *)

%K sign

%O 0,2

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

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Last modified January 28 23:12 EST 2022. Contains 350670 sequences. (Running on oeis4.)