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A222899
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Number of n X n 0..3 arrays with no more than floor(n X n/2) elements unequal to at least one horizontal or antidiagonal neighbor, with new values introduced in row major 0..3 order.
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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..0..1....0..1..2....0..0..0....0..0..1....0..1..2....0..0..1....0..0..1
..2..2..2....1..1..1....0..0..1....2..3..3....2..2..2....0..1..1....0..0..0
..2..2..2....1..1..1....2..0..0....3..3..3....2..2..2....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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