A012563 - OEIS

%I #4 Feb 24 2012 12:50:53

%S 1,0,12,-120,8400,-600000,73313856,-12123226752,2695239655680,

%T -769790431168512,275082505104161792,-120207067043213252608,

%U 63066575428691877122048,-39120958138480154972405760

%N cosh(sinh(x)*arctan(x))=1+12/4!*x^4-120/6!*x^6+8400/8!*x^8...

%K sign

%O 0,3

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