A256669 a(n) = (n!)! - n! - n.

0, -1, -2, 711, 620448401733239439359972

Offset: 0

Author

Assoul Abdelkarim, Apr 07 2015

Keywords

• sign

Comments

For n>0, a(n) is divisible by n. - Michel Marcus, Apr 08 2015

Examples

			For n=3, a(3) = (3!)!-3!-3 = 6!-6-3 = 720-9 = 711.
		

Crossrefs

Cf. A256509.

Programs

Magma

[Factorial(Factorial(n))-Factorial(n)-n: n in [0..5]]; // Vincenzo Librandi, Apr 08 2015

Maple

A256669:=n->(n!)!-n!-n: seq(A256669(n), n=0..5); # Wesley Ivan Hurt, Apr 14 2015

Mathematica

Table[(n!)! - n! - n, {n, 5}] (* Michael De Vlieger, Apr 07 2015 *)

Sage

[factorial(factorial(n))-factorial(n)-n for n in [0..6]] # Bruno Berselli, Apr 08 2015