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%I #4 Feb 24 2012 12:50:41
%S 1,-3,49,-1971,147457,-17712131,3119521521,-757475512691,
%T 242537719364737,-99014166389423235,50196880291533920305,
%U -30939568726951088808371,22784988607303653453394305
%N arctan(arcsin(tanh(x)))=x-3/3!*x^3+49/5!*x^5-1971/7!*x^7+147457/9!*x^9...
%K sign
%O 0,2
%A Patrick Demichel (patrick.demichel(AT)hp.com)