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A266433
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Number of 7Xn binary arrays with rows and columns lexicographically nondecreasing and column sums nondecreasing.
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1
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8, 70, 826, 12758, 223075, 3825307, 59155748, 798834778, 9379683461, 96481143688, 879275711012, 7183343579974, 53182973236784, 360298764101463, 2252503422916387, 13090825673375302, 71176326297105679, 364068218093477268
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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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FORMULA
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Empirical polynomial of degree 57 (see link above)
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EXAMPLE
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Some solutions for n=4
..0..0..0..0....0..0..0..0....0..0..1..1....0..0..0..0....0..0..0..1
..0..0..1..1....0..0..0..0....0..1..0..1....0..0..1..1....0..0..0..1
..0..0..1..1....0..0..0..1....0..1..1..0....0..0..1..1....0..0..0..1
..0..1..0..1....0..0..0..1....0..1..1..1....0..1..0..0....0..1..1..0
..0..1..0..1....0..0..0..1....1..0..0..0....0..1..0..1....0..1..1..0
..1..0..1..1....0..1..1..0....1..0..1..0....0..1..0..1....1..0..0..1
..1..1..0..0....0..1..1..0....1..1..0..1....1..0..1..0....1..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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