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exp(arctan(x)*tan(x))=1+2/2!*x^2+12/4!*x^4+280/6!*x^6+7952/8!*x^8...
0

%I #4 Feb 24 2012 12:50:50

%S 1,2,12,280,7952,532768,30306496,4657640832,327222722816,

%T 131738463674880,2341955285781504,10584761954697844736,

%U -1750594656814587244544,2213182839332047713673216

%N exp(arctan(x)*tan(x))=1+2/2!*x^2+12/4!*x^4+280/6!*x^6+7952/8!*x^8...

%K sign

%O 0,2

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