%I #4 Feb 24 2012 12:51:20
%S 2,-16,800,-97536,22208000,-8125689856,4360566579200,
%T -3226435003416576,3148058338141798400,-3916271639106285469696,
%U 6050134274987713730969600,-11363591103950667093393801216
%N arctan(tanh(x)+tan(x))=2*x-16/3!*x^3+800/5!*x^5-97536/7!*x^7...
%K sign
%O 0,1
%A Patrick Demichel (patrick.demichel(AT)hp.com)