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%I #8 Oct 13 2014 18:13:50
%S 1,-3,49,-1691,108961,-10415699,1476822801,-274051642731,
%T 68034310337345,-20698489943585315,7945165226724184305,
%U -3587174193714146380475,1968139895275233488888545,-1234522114580149082237390195,916981332590411294370399470545
%N tanh(arctan(arcsin(x)))=x-3/3!*x^3+49/5!*x^5-1691/7!*x^7+108961/9!*x^9...
%H Harvey P. Dale, <a href="/A012199/b012199.txt">Table of n, a(n) for n = 0..100</a>
%t With[{nn=30},Take[CoefficientList[Series[Tanh[ArcTan[ArcSin[x]]],{x,0,nn}],x] Range[0,nn-1]!,{2,-1,2}]] (* _Harvey P. Dale_, Oct 13 2014 *)
%K sign
%O 0,2
%A Patrick Demichel (patrick.demichel(AT)hp.com)
%E More terms from _Harvey P. Dale_, Oct 13 2014
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