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A221322
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Number of n X n arrays of occupancy after each element stays put or moves to some horizontal or antidiagonal neighbor, with no occupancy greater than 2
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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
..1..1..2....2..0..1....0..2..0....1..0..2....0..2..1....1..0..1....2..1..0
..0..0..1....1..2..1....1..2..1....1..1..0....2..0..0....1..2..1....2..1..1
..1..1..2....0..2..0....0..1..2....2..1..1....1..2..1....1..2..0....1..1..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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