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a(n) = (n^n)!.
2

%I #15 Sep 08 2022 08:45:05

%S 1,1,24,10888869450418352160768000000

%N a(n) = (n^n)!.

%C Next term: 857817775342842654119...0 (507 digits). - _Vladimir Joseph Stephan Orlovsky_, Dec 03 2008

%F a(n) = A000142(A000312(n)). - _Michel Marcus_, Jan 12 2015

%e a(0) = (0^0)! = 1! = 1;

%e a(1) = (1^1)! = 1! = 1;

%e a(2) = (2^2)! = 4! = 24;

%e a(3) = (3^3)! = 27! = 10888869450418352160768000000.

%t a[n_]:=(n^n)!; (* _Vladimir Joseph Stephan Orlovsky_, Dec 03 2008 *)

%o (Magma) [Factorial(n^n): n in [0..5]]; // _Vincenzo Librandi_, Jan 20 2015

%Y Cf. A000142, A000312, A068740, A068742.

%K nonn

%O 0,3

%A _Henry Bottomley_, Feb 26 2002