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A268880
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Number of n X n binary arrays with some element plus some horizontally or antidiagonally adjacent neighbor totalling two exactly once.
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1
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0, 5, 84, 4133, 317966, 55491832, 19876401224, 15564645769042, 26617222097087230, 99905925686618815012, 832547140418699137884096, 15355865014207234684746438192, 632296902429868672596327438625296
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OFFSET
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1,2
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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..0..0. .0..1..0..1. .0..0..0..1. .0..0..1..0. .0..0..0..0
..0..0..0..0. .0..1..0..0. .0..0..1..0. .1..0..1..0. .0..1..0..1
..0..0..0..0. .1..0..0..1. .1..0..1..0. .0..0..0..0. .0..1..0..0
..0..0..0..1. .0..0..0..1. .1..0..0..1. .1..0..1..1. .1..0..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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