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

1, 1, 1, 120, 25852016738884976640000

Offset

0,4

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

Table of n, a(n) for n=0..4.

Index to divisibility sequences

Index entries for sequences related to factorial numbers

Formula

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

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

Prog

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

Crossrefs

Cf. A000142, A000197, A010050.

Sequence in context: A172730 A365266 A045509 * A106547 A106544 A370512

Adjacent sequences: A033184 A033185 A033186 * A033188 A033189 A033190

Keyword

nonn,easy

Author

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

Extensions

Corrections made by Eric M. Schmidt, Jan 23 2013

Status

approved