%I #13 Sep 08 2022 08:46:14
%S 1,6,181440,1814811575069725360128000000
%N a(n) = (3^n)! / n!.
%C Next term is too large to include.
%F a(n) = A079288(n)/A000142(n).
%e For n = 2, a(n) = (3^2)! / (2)! = 181440.
%t Table[(3^n)! / n!, {n, 0, 6}] (* _Vincenzo Librandi_, Sep 15 2015 *)
%o (PARI) a(n) = (3^n)! / n!;
%o vector(5, n, a(n-1))
%o (Magma) [Factorial(3^n) / Factorial(n): n in [0..6]]; // _Vincenzo Librandi_, Sep 15 2015
%Y Cf. A079288, A000142.
%K nonn
%O 0,2
%A _Altug Alkan_, Sep 14 2015