%I #4 Feb 24 2012 12:51:28
%S 1,0,0,90,-2520,368550,-24324300,6214858650,-725350626000,
%T 318282066852750,-56464293738352500,40214549353890161250,
%U -9894502805503110795000,10823754426851479957593750
%N sec(arcsin(x)-arctan(x))=1+90/6!*x^6-2520/8!*x^8+368550/10!*x^10...
%K sign
%O 0,4
%A Patrick Demichel (patrick.demichel(AT)hp.com)