The OEIS is supported by the many generous donors to the OEIS Foundation.
%I #4 Feb 24 2012 12:51:27
%S 1,0,0,10,-1288,152934,-21890484,4000052186,-926239082416,
%T 266931734963214,-94074704256622668,39914182012094267618,
%U -20108103789380727679816,11884006709783387983027670
%N sec(sin(x)-arctan(x))=1+10/6!*x^6-1288/8!*x^8+152934/10!*x^10...
%K sign
%O 0,4
%A Patrick Demichel (patrick.demichel(AT)hp.com)