A172541 Number of n X n 0..1 arrays with row sums 7 and column sums 7.

0, 0, 0, 0, 0, 0, 1, 40320, 14398171200, 8302816499443200, 7722015017013984456000, 11649337108041078980732943360, 28278447454165011203551734584421120, 108738182111446498614705217754614976371200

Offset

1,8

Links

R. H. Hardin, Table of n, a(n) for n=1..23

Crossrefs

Column 7 of A008300, Cf. A075754.

Sequence in context: A045516 A160318 A227670 * A287084 A071550 A181724

Adjacent sequences: A172538 A172539 A172540 * A172542 A172543 A172544

Keyword

nonn

Author

R. H. Hardin, Feb 06 2010

Status

approved