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A154656 Number of permutations of length n within distance 7. 3
1, 2, 6, 24, 120, 720, 5040, 40320, 287280, 1865520, 11345160, 66349464, 381523758, 2193664790, 12764590275, 75796724309, 455383613924, 2750869551868, 16635586999056, 100439873614656, 604666567043712, 3629299734118656 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

a(n) equals the permanent of the n X n matrix with 1's along the central fifteen diagonals, and 0's everywhere else. - John M. Campbell, Jul 10 2011

LINKS

R. H. Hardin, Table of n, a(n) for n=1..400, Jul 11 2010

Torleiv Kløve, Spheres of Permutations under the Infinity Norm - Permutations with limited displacement, Reports in Informatics, Department of Informatics, University of Bergen, Norway, no. 376, November 2008.

CROSSREFS

Cf. A000045, A002524, A002526, A072856, A154654.

Sequence in context: A273695 A177279 A173848 * A179354 A179360 A179367

Adjacent sequences:  A154653 A154654 A154655 * A154657 A154658 A154659

KEYWORD

nonn

AUTHOR

Torleiv Kløve, Jan 13 2009

STATUS

approved

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Last modified March 24 06:12 EDT 2017. Contains 283984 sequences.