A033187 a(n) = (n!)!/n!.

1, 1, 1, 120, 25852016738884976640000

Offset: 0

Author

Ken Alverson (KenA(AT)tso.cin.ix.ne)

Keywords

• nonn
• easy

Comments

The next two terms have 197 and 1744 decimal digits, respectively.

a(n) gives the number of different ways in which a table of permutations for n objects can be arranged when one of them is fixed at the same place. Also: some of the first terms in this sequence belong to A010050. - R. J. Cano, Jan 23 2013

Links

• Index to divisibility sequences
• Index entries for sequences related to factorial numbers

Crossrefs

Cf. A000142, A000197, A010050.

Programs

PARI

a(n)=(n!-1)! \\ R. J. Cano, Jan 23 2013

Formula

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

a(n) = A000197(n)/n!.

Extensions

Corrections made by Eric M. Schmidt, Jan 23 2013