%I #4 Feb 24 2012 12:51:02
%S 1,0,-1,-6,-15,60,975,5390,-10143,-563976,-5982945,-9594398,788690001,
%T 14618418100,85743956207,-2026783258890,-64627785960767,
%U -716881015039504,7211897523161151,458865700394648778
%N sech(arcsinh(x)*exp(x))=1-1/2!*x^2-6/3!*x^3-15/4!*x^4+60/5!*x^5...
%K sign
%O 0,4
%A Patrick Demichel (patrick.demichel(AT)hp.com)