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A296321
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Number of n X n 0..1 arrays with each 1 horizontally, vertically or antidiagonally adjacent to 2 neighboring 1's.
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0
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1, 3, 11, 61, 853, 20088, 850404, 72224019, 11207386103, 3245575984755, 1784744625714267, 1830394475306895557, 3517200566091635085954, 12698075318404649075573041, 85871949097296276009847589332
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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=5
..0..0..0..1..1. .0..0..0..0..0. .0..1..1..0..0. .0..0..0..1..1
..0..0..1..0..1. .0..0..0..0..0. .1..0..1..0..0. .0..0..1..0..1
..0..0..1..0..1. .0..1..1..0..0. .1..1..0..1..1. .0..0..1..1..0
..0..1..0..0..1. .0..1..0..1..0. .0..0..0..1..0. .0..0..0..0..0
..0..1..1..1..0. .0..0..1..1..0. .0..0..0..0..0. .0..0..0..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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