A172628 Number of n X n 0..2 arrays with row sums 7 and column sums 7.

0, 0, 0, 24, 111920, 2030271480, 91358224634433, 9350902053107858880, 2018328183128437950016800, 859819730886010540636567920000, 682948436592331311886782349445512800

Offset

1,4

Links

R. H. Hardin, Table of n, a(n) for n=1..21

Crossrefs

Sequence in context: A052504 A382620 A159388 * A391877 A294318 A061527

Adjacent sequences: A172625 A172626 A172627 * A172629 A172630 A172631

Keyword

nonn

Author

R. H. Hardin, Feb 06 2010

Status

approved