A012070 - OEIS

%I #6 Feb 12 2015 11:37:52

%S 1,0,4,136,9424,1075264,183697344,43928797056,14007826346240,

%T 5742582570096640,2941974233347077120,1841370038568483235840,

%U 1382314169497713897656320,1225713884449600233499770880

%N tanh(arcsin(arcsin(x)))=x+4/5!*x^5+136/7!*x^7+9424/9!*x^9...

%t With[{nn=30},Take[CoefficientList[Series[Tanh[ArcSin[ArcSin[x]]],{x,0,nn}],x] Range[0,nn-1]!,{2,-1,2}]] (* _Harvey P. Dale_, Feb 12 2015 *)

%K nonn

%O 0,3

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