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%I #4 Feb 24 2012 12:50:40
%S 1,3,49,2187,186337,25929907,5355694161,1539910627387,588565856592577,
%T 288782211525088995,176996414128700874865,132567145102215208555627,
%U 119162444909413724755024545
%N arcsin(arcsin(sinh(x)))=x+3/3!*x^3+49/5!*x^5+2187/7!*x^7+186337/9!*x^9...
%K nonn
%O 0,2
%A Patrick Demichel (patrick.demichel(AT)hp.com)
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