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A004246 Number of permutations of length n with spread 3. 1
8, 25, 144, 735, 4608, 39285, 362000, 3628185, 40808448, 478988081, 6227101888, 87248724750, 1300561920000, 20922788404479, 355587467242752, 6402373698206889, 121810906419200000 (list; graph; refs; listen; history; text; internal format)
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 * A220535 A060718 A060743

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

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Last modified August 11 00:32 EDT 2020. Contains 336403 sequences. (Running on oeis4.)