%I #4 Feb 24 2012 12:51:27
%S 1,0,0,-90,-2520,-126630,-2243340,382612230,134674853040,
%T 26271944587890,4394379581092620,324925984573170750,
%U -181350289825568364600,-145875833202121504544790
%N sech(sin(x)-tan(x))=1-90/6!*x^6-2520/8!*x^8-126630/10!*x^10...
%K sign
%O 0,4
%A Patrick Demichel (patrick.demichel(AT)hp.com)