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A266939
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Number of 6Xn binary arrays with rows lexicographically nondecreasing and columns lexicographically nondecreasing and row sums nondecreasing and column sums nonincreasing.
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0
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7, 29, 92, 288, 871, 2577, 7185, 19529, 50216, 125786, 298869, 696808, 1546941, 3382516, 7085876, 14650326, 29153966, 57417292, 109223923, 205966389, 376634957, 683318087, 1206075185, 2114385852, 3615867548
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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....0..0..0..1....0..0..1..1....0..0..0..1....0..0..0..1
..0..0..0..1....0..0..1..0....0..1..0..1....0..0..1..0....0..0..1..1
..0..0..0..1....0..1..0..0....1..0..0..1....0..0..1..0....1..1..0..0
..1..1..1..0....1..0..0..0....1..0..1..0....0..1..0..0....1..1..0..0
..1..1..1..0....1..0..0..0....1..1..0..0....1..0..0..0....1..1..1..0
..1..1..1..0....1..1..1..1....1..1..1..0....1..1..0..1....1..1..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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