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A223145
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Number of nX3 0..2 arrays with no more than floor(nX3/2) elements equal to at least one horizontal, vertical or antidiagonal neighbor, with new values introduced in row major 0..2 order
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1
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2, 31, 211, 4065, 23376, 487176, 2859044, 61675900, 371133369, 8139180914, 49841557459, 1103204549801, 6833901039820, 152165504230294, 950031309571622, 21243203251932990, 133380148664076565, 2991998436727716610
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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=3
..0..1..2....0..1..0....0..1..2....0..1..2....0..1..2....0..1..2....0..1..2
..2..1..0....1..2..0....2..0..0....2..0..1....1..1..0....1..0..2....2..2..2
..0..2..0....0..1..2....1..0..1....1..2..0....0..2..1....2..1..0....0..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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