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A266545
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Number of nX6 binary arrays with rows and columns lexicographically nondecreasing and row and column sums nonincreasing.
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0
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2, 5, 11, 27, 58, 176, 366, 1062, 2571, 7345, 17540, 47970, 109375, 272134, 595031, 1359839, 2827311, 6072251, 12027150, 24388681, 46416427, 89575530, 164016985, 303788687, 537614351, 959313275, 1647205384
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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=6
..0..0..0..1..1..1....0..0..0..1..1..1....0..0..0..1..1..1....0..0..0..1..1..1
..0..1..1..0..0..0....0..1..1..0..0..1....0..0..1..0..1..1....0..0..1..0..1..1
..1..0..0..0..0..0....1..0..0..1..1..0....0..1..1..0..0..0....0..1..1..0..0..1
..1..0..0..0..0..0....1..1..1..0..0..0....1..0..0..1..0..0....1..0..1..0..1..0
..1..0..0..0..0..0....1..1..1..0..0..0....1..1..0..0..0..0....1..1..0..1..0..0
..1..0..0..0..0..0....1..1..1..0..0..0....1..1..0..0..0..0....1..1..0..1..0..0
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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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