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A172893
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Number of n X n 0..6 arrays with row sums 9 and column sums 9.
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1
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0, 4, 811, 1624984, 17046289085, 747054974484580, 114730784954807798280, 53679014250694594378460480, 68263787608482538080643047338467, 214735064836225772744899504151062116600
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OFFSET
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1,2
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LINKS
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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