%I #4 Feb 24 2012 12:50:40
%S 1,0,-4,80,5456,511360,83316416,18755459840,5535063173376,
%T 2088819464171520,981883326234254336,562564553455472742400,
%U 385997167840660261687296,312523332440480815021588480
%N tanh(arcsin(sinh(x)))=x-4/5!*x^5+80/7!*x^7+5456/9!*x^9+511360/11!*x^11...
%K sign
%O 0,3
%A Patrick Demichel (patrick.demichel(AT)hp.com)