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A266426
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Number of nX6 binary arrays with rows and columns lexicographically nondecreasing and column sums nondecreasing.
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0
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7, 63, 574, 5365, 49894, 448649, 3825307, 30555624, 227542455, 1579153474, 10236107278, 62184207773, 355425984636, 1918894455423, 9822580592133, 47841257692021, 222427734697477, 990076818618586
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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=4
..0..0..0..1..1..1....0..0..0..0..0..0....0..0..1..1..1..1....0..0..0..0..0..1
..1..1..1..0..0..0....0..0..0..1..1..1....0..0..1..1..1..1....0..0..0..1..1..1
..1..1..1..1..1..1....0..0..0..1..1..1....1..1..0..0..0..1....0..1..1..1..1..1
..1..1..1..1..1..1....0..0..1..0..0..0....1..1..0..1..1..1....1..1..1..0..1..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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