%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)