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

2,2

Links

Table of n, a(n) for n=2..15.

Example

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].

Sequence in context: A322556 A295413 A202799 * A239365 A277262 A226358

Adjacent sequences: A121345 A121346 A121347 * A121349 A121350 A121351

Keyword

nonn

Author

Hugo Pfoertner, Aug 15 2006

Status

approved