%I #16 Jul 24 2018 21:23:42
%S 1,0,12,240,5936,155520,65472,981903104,223580862720,
%T 46255608778752,10060678641587200,2368138744630923264,
%U 601490101481648443392,161192778898870464512000,43208403753541588946141184
%N Expansion of e.g.f. cos(x*tan(x)), even terms only.
%H G. C. Greubel, <a href="/A009080/b009080.txt">Table of n, a(n) for n = 0..240</a>
%e cos(x*tan(x)) = 1/0! +0*x^2/2! 12*x^4/4! 240*x^6/6! 5936*x^8/8! ...
%t With[{nmax = 60}, CoefficientList[Series[Cos[x*Tan[x]], {x, 0, nmax}], x]*Range[0, nmax]!][[1 ;; 1 ;; 2]] (* _G. C. Greubel_, Jul 24 2018 *)
%o (PARI) x='x+O('x^60); v=Vec(serlaplace(cos(x*tan(x)))); vector(#v\2,n,v[2*n1]) \\ _G. C. Greubel_, Jul 24 2018
%K sign
%O 0,3
%A _R. H. Hardin_
%E Extended with signs by _Olivier GĂ©rard_, Mar 15 1997
