A256509 a(n) = (n!)! - n! - 1.

-1, -1, -1, 713, 620448401733239439359975

Offset: 0

Author

Assoul Abdelkarim, Mar 31 2015

Keywords

• sign

Comments

Term a(5) has 199 decimal digits. - Michael De Vlieger, Mar 31 2015

Examples

			a(3) = (3!)! - 3! - 1 = 720 - 6 - 1 = 713.
		

Programs

Mathematica

Table[(n!)! - n! - 1, {n, 0, 5}] (* Michael De Vlieger, Mar 31 2015 *)