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%I #6 Nov 09 2022 13:30:02
%S 1,1,-11,-83,10505,6009,-60553539,2140355557,1174906248337,
%T -146823377897103,-55094515820657147,17482899642565858461,
%U 4900898798285366105753,-3664217968514770645784087
%N sec(cos(x)*sin(x))=1+1/2!*x^2-11/4!*x^4-83/6!*x^6+10505/8!*x^8...
%t With[{nn=30},Take[CoefficientList[Series[Sec[Cos[x]Sin[x]],{x,0,nn}],x] Range[0,nn]!,{1,-1,2}]] (* _Harvey P. Dale_, Nov 09 2022 *)
%K sign
%O 0,3
%A Patrick Demichel (patrick.demichel(AT)hp.com)
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