A079288 -id:A079288 - cp's OEIS frontend

0, 4, 362856, 10888869450418352160767959680

Offset: 0

Cino Hilliard, Feb 08 2003

Sum_{n>0} 1/a(n) = 0.25000275591...
The next term is too large to include.
The next term (a(4)) has 121 digits. - Harvey P. Dale, Jan 10 2024

Table[(3^n)!-(2^n)!,{n,0,4}] (* Harvey P. Dale, Jan 10 2024 *)

atonfact(n) = {for(x=0, n, y = (3^x)!-(2^x)!; print1(y, ", "));}

a(n) = A079288(n) - A000722(n). - Michel Marcus, Jul 08 2024

1, 6, 181440, 1814811575069725360128000000

Offset: 0

Altug Alkan, Sep 14 2015

Next term is too large to include.

			For n = 2, a(n) = (3^2)! / (2)! = 181440.

[Factorial(3^n) / Factorial(n): n in [0..6]]; // Vincenzo Librandi, Sep 15 2015

Table[(3^n)! / n!, {n, 0, 6}] (* Vincenzo Librandi, Sep 15 2015 *)

a(n) = (3^n)! / n!;
vector(5, n, a(n-1))

a(n) = A079288(n)/A000142(n).

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