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%I #4 Feb 24 2012 12:51:28
%S 1,0,0,-90,1176,-185094,6953628,-2271831562,113771489552,
%T -90523142172238,2740534463632996,-9209167403962507058,
%U -464269042403340299048,-2066044589238157561264950
%N sech(arcsin(x)-tanh(x))=1-90/6!*x^6+1176/8!*x^8-185094/10!*x^10...
%K sign
%O 0,4
%A Patrick Demichel (patrick.demichel(AT)hp.com)
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