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arcsin(arctan(arctanh(x)))=x+1/3!*x^3+17/5!*x^5+505/7!*x^7+32321/9!*x^9...
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%I #6 Nov 28 2016 18:07:01

%S 1,1,17,505,32321,3196337,474305361,96903709929,26267702181889,

%T 9102885308254561,3930753230143374609,2069316409758628885721,

%U 1305070038882436410153793,971558826878073011961325841

%N arcsin(arctan(arctanh(x)))=x+1/3!*x^3+17/5!*x^5+505/7!*x^7+32321/9!*x^9...

%t With[{nn=30},Take[CoefficientList[Series[ArcSin[ArcTan[ArcTanh[x]]],{x,0,nn}],x] Range[0,nn-1]!,{2,-1,2}]] (* _Ray Chandler_, Nov 28 2016 *)

%K nonn

%O 0,3

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