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A301778
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Number of n X n 0..1 arrays with every element equal to 0, 1, 2 or 3 horizontally or vertically adjacent elements, with upper left element zero.
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1
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1, 8, 240, 25872, 10033408, 14004742144, 70356843337600, 1272146363687760896, 82788264567204704083456, 19391044190172624196057083904, 16346860632996556855602568035358720
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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..0..0. .0..0..0..0..0. .0..0..0..0..0. .0..0..0..0..0
..0..0..1..0..1. .0..0..1..0..1. .0..0..0..0..1. .0..0..1..0..0
..0..0..0..0..1. .1..0..1..1..0. .1..1..1..1..0. .0..0..1..1..0
..1..1..0..1..1. .0..0..1..1..1. .0..0..0..1..0. .1..1..1..0..1
..0..1..1..0..0. .0..0..0..0..0. .1..0..1..0..0. .0..1..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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