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%I #4 Feb 24 2012 12:50:40
%S 1,1,9,337,20433,2146497,334449049,72730741137,21072553238433,
%T 7839688801269505,3643403659959276585,2068430144100589034577,
%U 1408597220893698317848945,1133327555472108223412440257
%N arcsinh(arcsin(sinh(x)))=x+1/3!*x^3+9/5!*x^5+337/7!*x^7+20433/9!*x^9...
%K nonn
%O 0,3
%A Patrick Demichel (patrick.demichel(AT)hp.com)
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