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%I #6 Jul 06 2023 15:01:53
%S 1,0,-4,-136,-7408,-644416,-84562880,-15811723136,-4005496370944,
%T -1317763889887232,-544096638435718144,-274416039275290634240,
%U -165481485047921126273024,-117299354914466636092850176
%N sin(sin(arctanh(x)))=x-4/5!*x^5-136/7!*x^7-7408/9!*x^9-644416/11!*x^11...
%t With[{nn=30},Take[CoefficientList[Series[Sin[Sin[ArcTanh[x]]],{x,0,nn}],x] Range[0,nn-1]!,{2,-1,2}]] (* _Harvey P. Dale_, Jul 06 2023 *)
%K sign
%O 0,3
%A Patrick Demichel (patrick.demichel(AT)hp.com)
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