A121348 Difference between (n!)^2 and the next smaller factorial.

1, 12, 456, 9360, 155520, 21772800, 1146700800, 44503603200, 11860515072000, 1237663494144000, 107797432393728000, 36342886035456000000, 6476053728774389760000, 1089563850990959984640000

Offset: 2

Author

Hugo Pfoertner, Aug 15 2006

Keywords

• nonn

Examples

			a(3)=12 because the difference between (3!)^2=36 and the next smaller factorial 4!=24 is 12.
		

Crossrefs

Cf. A121347 [Largest number k such that (n!)^2-k!>0].