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A186580
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Number of (n+3)X(n+3) 0..2 arrays with every 4X4 subblock commuting with each horizontal and vertical neighbor 4X4 subblock
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0
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43046721, 827, 5879, 163723, 569947, 811795, 855715, 1049539, 1464331, 2211763, 3510715, 6188179, 16060459, 36931171, 74101531, 139265491, 305505067, 600286819, 1098007483
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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 5X5
..0..0..0..0..0....0..0..2..2..0....0..0..0..0..0....0..0..0..0..0
..2..0..0..0..0....0..0..0..0..2....0..0..0..0..0....0..0..0..0..0
..1..2..0..0..0....0..0..0..0..0....1..0..0..0..0....1..0..0..0..0
..2..1..2..0..0....0..0..0..0..0....2..0..0..0..0....0..1..0..0..0
..1..2..1..2..0....0..0..0..0..0....0..0..0..0..2....2..0..1..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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