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A266359
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Number of nX5 binary arrays with rows and columns lexicographically nondecreasing and row and column sums nondecreasing.
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1
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6, 34, 173, 830, 3669, 14921, 55734, 191916, 612871, 1827072, 5118950, 13561326, 34161206, 82219937, 189887848, 422385924, 907900116, 1891159167, 3827190045, 7541618443, 14499264935, 27245395504, 50118187760, 90379795961, 159985071253
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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..0..0....0..0..0..1..1....0..0..0..0..0....0..0..0..0..1
..0..0..0..0..1....0..1..1..0..0....0..0..0..0..1....0..0..0..1..1
..0..0..0..1..1....1..0..1..0..1....0..0..0..0..1....0..0..1..0..1
..1..1..1..1..0....1..1..0..1..1....0..0..1..1..1....1..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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