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A012998 sin(arctan(x)+tan(x))=2*x-8/3!*x^3+72/5!*x^5-3936/7!*x^7... 0

%I

%S 2,-8,72,-3936,193920,-21876736,2967878656,-589063146496,

%T 149737853943808,-48291040167362560,19310260456438693888,

%U -9310185546185219768320,5359263862743046978797568

%N sin(arctan(x)+tan(x))=2*x-8/3!*x^3+72/5!*x^5-3936/7!*x^7...

%t With[{nn=30},Take[CoefficientList[Series[Sin[ArcTan[x]+Tan[x]],{x,0,nn}],x] Range[0,nn-1]!,{2,-1,2}]] (* _Harvey P. Dale_, Dec 17 2017 *)

%K sign

%O 0,1

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

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Last modified January 26 15:18 EST 2022. Contains 350599 sequences. (Running on oeis4.)