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A266424
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Number of nX4 binary arrays with rows and columns lexicographically nondecreasing and column sums nondecreasing.
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1
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5, 25, 106, 404, 1391, 4383, 12758, 34611, 88206, 212609, 487630, 1069664, 2254259, 4581719, 9011222, 17200214, 31944220, 57853902, 102380657, 177341666, 301156443, 502075951, 822789263, 1326908069, 2107999291, 3302022425
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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..1..1....0..0..0..1....0..0..0..0....0..0..1..1....0..0..0..1
..0..1..0..1....0..1..1..0....0..1..1..1....0..0..1..1....0..0..1..1
..0..1..1..1....0..1..1..1....0..1..1..1....0..1..1..1....0..1..1..1
..1..0..0..0....1..0..1..1....1..1..1..1....0..1..1..1....1..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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