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%I #4 Feb 24 2012 12:51:09
%S 1,1,9,225,6993,467745,29529753,4297350785,378759492257,
%T 122599030798017,8002975063348265,9354851201922233249,
%U -686072407102337430543,1787263355638656126843105
%N cosh(sec(x)*arcsinh(x))=1+1/2!*x^2+9/4!*x^4+225/6!*x^6+6993/8!*x^8...
%K sign
%O 0,3
%A Patrick Demichel (patrick.demichel(AT)hp.com)
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