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A317856
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Number of nXn 0..1 arrays with every element unequal to 1, 2 or 4 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.
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0
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0, 3, 4, 56, 350, 3315, 33238, 517734, 8875636, 219127394, 6925306920
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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..1..0..0. .0..0..0..0..0. .0..0..1..0..0. .0..1..0..1..0
..1..0..0..0..1. .1..1..1..0..1. .1..0..0..1..1. .1..1..1..1..0
..0..0..0..0..0. .1..1..0..0..0. .0..0..0..1..0. .1..1..1..1..0
..0..1..1..0..0. .0..1..1..0..1. .1..0..0..0..0. .0..1..0..0..1
..0..1..0..0..1. .1..1..0..0..0. .0..0..1..0..1. .1..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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