%I #6 Mar 06 2019 11:23:25
%S 1,3,57,2747,249777,36846835,8040193769,2437436057131,981033890934369,
%T 506479242594080227,326455632550618599065,257043518901496857566107,
%U 242838347551317678123524113
%N arcsin(arcsin(arcsin(x)))=x+3/3!*x^3+57/5!*x^5+2747/7!*x^7+249777/9!*x^9...
%t With[{nn=30},Take[CoefficientList[Series[ArcSin[ArcSin[ArcSin[x]]],{x,0,nn}],x] Range[0,nn-1]!,{2,-1,2}]] (* _Harvey P. Dale_, Mar 06 2019 *)
%K nonn
%O 0,2
%A Patrick Demichel (patrick.demichel(AT)hp.com)