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A269082
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Number of n X n binary arrays with some element plus some horizontally, vertically or antidiagonally adjacent neighbor totalling two not more than once.
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1
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2, 11, 114, 2238, 80422, 5372270, 673690710, 159449028034, 71709929917104, 61507638902069052, 100988524469068110876, 318195132133780181426070, 1928131640777904103958251102, 22507425106868892327680953474828
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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..1..0..0. .1..1..0..1. .0..0..0..1. .0..1..0..0. .1..0..1..1
..1..0..0..0. .0..0..0..0. .1..0..0..0. .0..0..0..1. .0..0..0..0
..0..0..0..0. .0..0..0..1. .1..0..1..0. .0..0..0..0. .1..0..0..1
..0..1..0..1. .1..0..0..0. .0..0..0..0. .1..0..0..0. .0..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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