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A268016
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Number of nX4 0..2 arrays with every repeated value in every row and column greater than or equal to the previous repeated value.
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1
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78, 6084, 474552, 31831908, 2012075697, 119453097281, 6761580343329, 367501986337710, 19300005472710895, 983989084426524929, 48888960624425750151, 2374418848334124952354, 113014440791056538695922
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OFFSET
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1,1
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COMMENTS
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LINKS
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EXAMPLE
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Some solutions for n=2
..2..1..0..0....2..1..2..1....0..2..2..2....2..1..1..1....0..2..1..1
..2..1..0..2....0..1..0..2....1..0..2..1....2..0..2..2....2..0..1..1
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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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