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A013175 sin(arctanh(x)+arctan(x))=2*x-8/3!*x^3+80/5!*x^5-4160/7!*x^7... 0

%I

%S 2,-8,80,-4160,177920,-25548800,2560563200,-702660608000,

%T 129295622144000,-57197188186112000,16886573106790400000,

%U -10912577096233779200000,4743735379760119808000000

%N sin(arctanh(x)+arctan(x))=2*x-8/3!*x^3+80/5!*x^5-4160/7!*x^7...

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

%K sign

%O 0,1

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

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Last modified June 28 12:00 EDT 2022. Contains 354907 sequences. (Running on oeis4.)