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%I #6 Jul 19 2024 19:15:42
%S 1,1,2,360,861733891296165888000
%N a(n) = (n!)!/((n-1)!)!.
%C a(5) has 177 digits.
%t a[0] = 1; a[n_] := a[n] = (n!)!/((n - 1)!)!;
%t Table[a[n], {n, 0, 6}]
%Y Cf. A000142.
%K nonn
%O 0,3
%A _Clark Kimberling_, Jul 16 2024