A012116 - OEIS

%I #7 Nov 21 2013 12:46:01

%S 1,1,9,113,6993,171777,45264153,412458993,1241225427105,

%T -81335384742015,102955176831541545,-22142143528417205775,

%U 20775502075935299781105,-8945394343172069982368895

%N sinh(arcsin(arcsinh(x)))=x+1/3!*x^3+9/5!*x^5+113/7!*x^7+6993/9!*x^9...

%t With[{nn=30},Take[CoefficientList[Series[Sinh[ArcSin[ArcSinh[x]]],{x,0,nn}], x]Range[0,nn-1]!,{2,-1,2}]] (* _Harvey P. Dale_, Mar 27 2012 *)

%K sign

%O 0,3

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