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A229840
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Number of n X n 0..2 arrays x(i,j) with each element horizontally or vertically next to at least one element with value 2-x(i,j)
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0
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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=3
..0..2..0....1..1..2....0..0..0....2..0..2....1..1..1....1..2..0....1..0..0
..1..0..0....1..1..0....2..2..2....1..1..2....0..2..1....1..0..2....1..2..2
..1..2..2....1..1..2....2..0..0....2..0..0....0..2..0....1..2..0....2..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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