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A278675
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Number of nX7 0..1 arrays with rows in nondecreasing lexicographic order and columns in nonincreasing lexicographic order, but with exactly one mistake.
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1
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56, 1050, 12727, 134265, 1378241, 14437336, 157706284, 1809189550, 21622163723, 263667893290, 3200723946503, 37898709431669, 431935945421546, 4704720632893357, 48828296440609470, 482618940316582616
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refs;
listen;
history;
text;
internal format)
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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
..1..1..1..1..0..0..0. .1..0..0..0..0..0..0. .0..0..0..0..0..1..1
..0..0..0..0..1..1..0. .1..1..1..1..1..1..0. .1..0..0..0..0..1..0
..1..0..0..0..0..0..0. .0..1..0..0..0..0..0. .1..1..0..0..0..0..1
..1..1..0..0..1..1..1. .0..1..1..1..1..0..1. .1..1..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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