A012108 - OEIS

%I #6 Mar 19 2015 10:16:17

%S 1,1,9,201,9649,809201,105268089,19650225401,4982657935329,

%T 1648151554792801,689411371817131369,355814217290199455401,

%U 222111401946937825176209,164952387078229730219557201

%N cosh(arcsin(sinh(x)))=1+1/2!*x^2+9/4!*x^4+201/6!*x^6+9649/8!*x^8...

%t With[{nn=30},Take[CoefficientList[Series[Cosh[ArcSin[Sinh[x]]],{x,0,nn}],x] Range[0,nn]!,{1,-1,2}]] (* _Harvey P. Dale_, Mar 19 2015 *)

%K nonn

%O 0,3

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