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A266469
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Number of nX7 binary arrays with rows and columns lexicographically nondecreasing and column sums nonincreasing.
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0
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2, 9, 52, 463, 5371, 77320, 1231170, 20115063, 319006954, 4768598707, 66353854322, 856330630443, 10262183989448
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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..0..0..1..1..1..1....0..0..0..0..0..0..0
..0..0..0..0..0..0..0....0..1..1..0..0..0..0....0..0..0..0..0..0..1
..0..0..0..0..0..0..1....1..0..0..1..1..1..1....0..0..0..1..1..1..0
..1..1..1..1..1..1..0....1..1..1..0..0..0..0....1..1..1..0..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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