%I #4 Feb 24 2012 12:50:41
%S 1,0,4,24,1744,61504,6700992,632723584,106726576384,19137224693760,
%T 4819549055104000,1376115921056118784,493566558620424622080,
%U 203121814961910275620864,99267625002820837091098624
%N arcsin(arcsin(tanh(x)))=x+4/5!*x^5+24/7!*x^7+1744/9!*x^9+61504/11!*x^11...
%K nonn
%O 0,3
%A Patrick Demichel (patrick.demichel(AT)hp.com)