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A269046
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Number of n X n 0..2 arrays with some element plus some horizontally, diagonally or antidiagonally adjacent neighbor totalling two not more than once.
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1
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3, 42, 594, 24192, 1643376, 242861616, 71430596250, 43961616939276, 56121206116838532, 149312689805356303800, 836315757545942679945480, 9777884421682321788379713444, 242268002268280142077867206348378
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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
..2..0..1..2. .1..2..1..2. .0..2..1..0. .2..2..2..2. .0..2..1..2
..1..2..1..0. .1..2..1..0. .1..0..1..0. .1..1..2..2. .1..0..1..2
..1..2..1..0. .1..0..1..0. .0..0..0..0. .2..2..2..1. .0..0..1..0
..1..0..1..0. .1..2..0..0. .0..0..0..1. .1..2..2..2. .0..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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