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%I
%S 1,-3,57,-2419,198801,-25335395,4816346441,-1245230547347,
%T 427817295559329,-186336568593526211,101138532707457916121,
%U -66575531182102753799603,52444802490227536269748273
%N arctan(arctan(arcsin(x)))=x-3/3!*x^3+57/5!*x^5-2419/7!*x^7+198801/9!*x^9...
%t With[{nn=30},Take[CoefficientList[Series[ArcTan[ArcTan[ArcSin[x]]],{x,0,nn}],x] Range[0,nn-1]!,{2,-1,2}]] (* _Harvey P. Dale_, Mar 15 2015 *)
%K sign
%O 0,2
%A Patrick Demichel (patrick.demichel(AT)hp.com)
%E Definition clarified by _Harvey P. Dale_, Mar 15 2015
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