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A172645
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Number of n X n 0..2 arrays with row sums n and column sums n.
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3
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1, 3, 31, 2371, 1084851, 3680774301, 91358224634433, 17470072106054582211, 26088526624958727703324771, 310419652143758898175543447421953, 29785621316391113552729016416250323294253
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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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