A012069 - OEIS

%I #6 Dec 06 2012 09:02:35

%S 1,1,17,561,39521,4429217,749371633,176540328017,55517224330689,

%T 22448523976439873,11356291769744087761,7026618486154627990385,

%U 5220988665867670545052193,4587518335717939527563335649

%N arcsinh(arcsin(arcsin(x)))=x+1/3!*x^3+17/5!*x^5+561/7!*x^7+39521/9!*x^9...

%t With[{nn=30},Take[CoefficientList[Series[ArcSinh[ArcSin[ArcSin[x]]],{x,0,nn}],x]Range[0,nn-1]!,{2,-1,2}]] (* _Harvey P. Dale_, Dec 06 2012 *)

%K nonn

%O 0,3

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