%I #4 Feb 24 2012 12:51:21
%S 1,0,4,-6,51,-180,1710,-9450,105525,-793800,10319400,-98232750,
%T 1463667975,-16856739900,283755121650,-3834908327250,72041492147625,
%U -1117601855370000,23190238498927500,-406108574195073750
%N cosh(arctanh(x)+log(x+1))=1+4/2!*x^2-6/3!*x^3+51/4!*x^4-180/5!*x^5...
%K sign
%O 0,3
%A Patrick Demichel (patrick.demichel(AT)hp.com)