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%I
%S 1,1,5,13,41,1529,-168851,14151621,-1169749807,65719458673,
%T 5735813087573,-3489760303917315,1000904582588332537,
%U -229661980583327166359,41111046331054702141117
%N sec(tan(tanh(x)))=1+1/2!*x^2+5/4!*x^4+13/6!*x^6+41/8!*x^8...
%K sign
%O 0,3
%A Patrick Demichel (patrick.demichel(AT)hp.com)
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