A004246 Number of permutations of length n with spread 3.

8, 25, 144, 735, 4608, 39285, 362000, 3628185, 40808448, 478988081, 6227101888, 87248724750, 1300561920000, 20922788404479, 355587467242752, 6402373698206889, 121810906419200000

Offset

4,1

Links

Table of n, a(n) for n=4..20.

R. L. Graham, and D. H. Lehmer, On the Permanent of Schur's Matrix, Jour. Australian Math. Soc. 21(4) (series A) (1976), 487-497.

Crossrefs

Sequence in context: A042189 A305680 A316927 * A362276 A220535 A060718

Adjacent sequences: A004243 A004244 A004245 * A004247 A004248 A004249

Keyword

nonn

Author

N. J. A. Sloane

Extensions

More terms from Herman Jamke (hermanjamke(AT)fastmail.fm), May 17 2007

Status

approved