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A301890
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Number of 7Xn 0..1 arrays with every element equal to 0, 1 or 3 horizontally or antidiagonally adjacent elements, with upper left element zero.
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1
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64, 610, 2841, 7883, 31173, 240222, 1454613, 7734317, 39492565, 231010966, 1368292090, 7943126611, 45394661195, 264505253778, 1552587576944, 9114661439887, 53464193088001, 314087978745270, 1846947051770084
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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=5
..0..1..0..1..0. .0..1..0..1..0. .0..0..1..0..1. .0..0..1..0..1
..0..1..0..1..0. .0..1..1..0..0. .1..1..1..1..1. .1..1..1..0..1
..0..0..0..1..0. .0..1..0..1..0. .0..1..0..0..0. .0..0..1..0..1
..1..1..0..0..1. .0..1..0..1..0. .0..1..0..1..0. .1..1..1..0..1
..0..1..0..0..1. .0..1..1..1..0. .0..1..0..1..0. .0..0..1..0..1
..0..0..1..0..1. .0..0..0..1..0. .1..0..1..0..1. .1..1..1..1..1
..0..1..0..1..0. .0..1..1..1..0. .1..0..1..0..0. .0..1..0..0..1
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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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