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A266467
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Number of nX5 binary arrays with rows and columns lexicographically nondecreasing and column sums nonincreasing.
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1
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2, 7, 28, 137, 735, 4074, 22128, 113677, 544142, 2417707, 9991874, 38585111, 139969744, 479482160, 1558677189, 4829461991, 14318767180, 40765225229, 111787710303, 296081929163, 759290568963, 1889449601320, 4571408444209
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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..1..1..1..1
..0..0..0..0..1....0..1..1..0..0....0..0..1..1..1....1..0..0..0..0
..0..0..1..1..0....1..0..0..0..0....1..1..0..0..0....1..0..1..1..1
..1..1..0..0..0....1..0..0..0..0....1..1..1..1..1....1..1..0..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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