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A268743
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Number of n X n binary arrays with some element plus some horizontally or vertically adjacent neighbor totalling two no more than once.
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1
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2, 11, 143, 4110, 255651, 34732937, 10319681062, 6744840113811, 9736268648482947, 31152408949342676906, 221573405414594347811555, 3511390061199964238627005057, 124222798189336185449669887550302
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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..0. .0..1..1..0. .1..0..0..0. .0..0..0..1. .1..0..0..1
..1..0..0..1. .0..0..0..0. .0..0..1..0. .0..1..0..0. .0..0..0..0
..0..0..0..0. .0..1..0..1. .0..0..0..1. .0..1..0..1. .0..0..1..0
..0..0..0..0. .0..0..0..0. .0..1..0..1. .1..0..0..0. .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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