A048632 Differences between factorials and Xfactorials: A048631 - A000142.

0, 0, 0, 0, 0, 0, 448, 3136, 25088, 238080, 2780160, 32409600, 439263232, 5793579008, 84589174784, 1277254508544, 20436072136704, 347559326515200, 6269816107433984, 119673237950431232, 2402480754490605568, 50578266728651816960, 1116823836321860550656

Offset: 0

Author

Antti Karttunen, Jul 14 1999

Keywords

• easy
• nonn

Crossrefs

Cf. A000142, A048631.

Formula

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