%I #4 Feb 24 2012 12:51:21
%S 1,-4,112,-7744,995840,-205558144,62203595776,-25948859891712,
%T 14273513699311616,-10010170584339742720,8717845696617764192256,
%U -9230668213290446763196416,11677592409577212192402440192
%N sech(tanh(x)+arctan(x))=1-4/2!*x^2+112/4!*x^4-7744/6!*x^6...
%K sign
%O 0,2
%A Patrick Demichel (patrick.demichel(AT)hp.com)
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