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A306171
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Number of nX7 0..1 arrays with every element unequal to 0, 1, 3, 5, 6 or 7 king-move adjacent elements, with upper left element zero.
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1
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21, 237, 252, 1372, 5421, 16195, 53834, 185090, 619073, 2213741, 7903854, 27396112, 97000671, 345456070, 1212355115, 4294891431, 15302228975, 54122847981, 192114679415, 684540291374, 2430461260505, 8640825474293, 30793872853587
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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..1..1..1..1..1. .0..0..0..1..0..0..0. .0..0..0..0..1..0..0
..1..1..1..1..1..1..0. .0..0..0..0..0..0..1. .0..0..0..0..0..0..0
..0..0..1..1..1..0..0. .0..0..0..0..0..0..0. .0..0..0..0..0..0..0
..0..1..1..1..1..1..1. .1..0..0..0..0..0..0. .0..0..0..0..0..0..0
..1..1..1..1..1..1..0. .1..1..0..0..0..0..1. .0..0..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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