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A300373
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Number of n X n 0..1 arrays with every element equal to 0, 2 or 3 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.
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0
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1, 3, 4, 26, 389, 8839, 481311, 47968011, 9905247305, 3987964431282, 3056200820361709
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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..1..0..1..1. .0..0..1..0..0. .0..1..0..0..1. .0..1..1..0..0
..1..1..1..1..0. .0..1..1..0..1. .1..1..0..1..1. .1..0..1..0..1
..0..0..0..0..0. .0..0..1..0..0. .1..0..1..0..0. .1..1..1..0..0
..0..1..1..1..1. .0..1..1..0..1. .0..0..1..0..1. .0..0..0..1..0
..1..1..0..1..0. .0..0..0..1..1. .0..1..1..1..1. .0..1..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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