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sech(arctan(arcsinh(x)))=1-1/2!*x^2+17/4!*x^4-769/6!*x^6+66401/8!*x^8...
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%I #4 Feb 24 2012 12:50:44

%S 1,-1,17,-769,66401,-9313281,1927198833,-551835917697,208856369686977,

%T -100945109069282817,60655475821737151953,-44346899335054478649345,

%U 38762487400695339770533665

%N sech(arctan(arcsinh(x)))=1-1/2!*x^2+17/4!*x^4-769/6!*x^6+66401/8!*x^8...

%K sign

%O 0,3

%A Patrick Demichel (patrick.demichel(AT)hp.com)