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%I #6 Feb 19 2020 14:43:46
%S 1,0,1,0,9,-20,177,-1260,7105,-99144,564049,-10278840,77134761,
%T -1412196188,15082747617,-257693157540,3771722331457,-62330454304272,
%U 1150241027577697,-19671866661968880,420212562193269513
%N Expansion of e.g.f.: sec(exp(x)-sec(x))=1+1/2!*x^2+9/4!*x^4-20/5!*x^5+177/6!*x^6...
%t With[{nn=20},CoefficientList[Series[Sec[Exp[x]-Sec[x]],{x,0,nn}],x] Range[ 0,nn]!] (* _Harvey P. Dale_, Feb 19 2020 *)
%K sign
%O 0,5
%A Patrick Demichel (patrick.demichel(AT)hp.com)
%E Definition clarified by _Harvey P. Dale_, Feb 19 2020
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