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A172893
Number of n X n 0..6 arrays with row sums 9 and column sums 9.
1
0, 4, 811, 1624984, 17046289085, 747054974484580, 114730784954807798280, 53679014250694594378460480, 68263787608482538080643047338467, 214735064836225772744899504151062116600
OFFSET
1,2
LINKS
CROSSREFS
Sequence in context: A114766 A239623 A202685 * A072725 A349067 A176186
KEYWORD
nonn
AUTHOR
R. H. Hardin, Feb 06 2010
STATUS
approved