%I #14 Sep 08 2022 08:44:37
%S 1,0,-1,3,-18,120,-966,8946,-93748,1094832,-14078036,197375420,
%T -2992213584,48700300272,-845573085072,15571699693200,
%U -302493769715504,6165508375224704,-131129003401938832,2892534929270217648
%N Expansion of e.g.f. cos(tan(log(1+x))).
%H G. C. Greubel, <a href="/A009065/b009065.txt">Table of n, a(n) for n = 0..250</a>
%t With[{nmax = 30}, CoefficientList[Series[Cos[Tan[Log[1 + x]]], {x, 0, nmax}], x]*Range[0, nmax]!] (* _G. C. Greubel_, Jul 24 2018 *)
%o (PARI) x='x+O('x^30); Vec(serlaplace(cos(tan(log(1+x))))) \\ _G. C. Greubel_, Jul 24 2018
%o (Magma) m:=30; R<x>:=PowerSeriesRing(Rationals(), m); b:=Coefficients(R!(Cos(Tan(Log(1+x))))); [Factorial(n-1)*b[n]: n in [1..m]]; // _G. C. Greubel_, Jul 24 2018
%K sign,easy
%O 0,4
%A _R. H. Hardin_
%E Extended with signs by _Olivier GĂ©rard_, Mar 15 1997