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cosh(arctan(x)+tan(x))=1+4/2!*x^2+16/4!*x^4+544/6!*x^6+11008/8!*x^8...
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%I #4 Feb 24 2012 12:51:15

%S 1,4,16,544,11008,1060224,38065152,9708670976,276991311872,

%T 283899182678016,-9456062364418048,21467065808907534336,

%U -3522630891818080796672,3483761539375407422242816

%N cosh(arctan(x)+tan(x))=1+4/2!*x^2+16/4!*x^4+544/6!*x^6+11008/8!*x^8...

%K sign

%O 0,2

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