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%I #4 Feb 24 2012 12:51:21
%S 2,-20,872,-82848,13615232,-3427600128,1224824628224,-589372636243968,
%T 367372633732907008,-287938978919399424000,277156456747324043952128,
%U -321405895510495023427223552
%N tanh(tanh(x)+arctan(x))=2*x-20/3!*x^3+872/5!*x^5-82848/7!*x^7...
%K sign
%O 0,1
%A Patrick Demichel (patrick.demichel(AT)hp.com)
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