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%I #6 Jun 30 2021 18:24:52
%S 1,0,12,-88,13968,-597440,132709184,-15685157504,5014687029504,
%T -1181425359497216,528315488687774720,-207409825492284028928,
%U 125603683629593633394688,-73594034552724198387236864
%N arcsin(arcsin(arctan(x)))=x+12/5!*x^5-88/7!*x^7+13968/9!*x^9...
%t With[{nn=30},Take[CoefficientList[Series[ArcSin[ArcSin[ArcTan[x]]],{x,0,nn}],x] Range[0,nn-1]!,{2,-1,2}]] (* _Harvey P. Dale_, Jun 30 2021 *)
%K sign
%O 0,3
%A Patrick Demichel (patrick.demichel(AT)hp.com)
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