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A222887
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Number of nX4 0..2 arrays with exactly floor(nX4/2) elements equal to at least one horizontal or vertical neighbor, with new values introduced in row major 0..2 order
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1
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6, 184, 8986, 465938, 24893100, 1351294947, 74202775749, 4110642829357, 229305087108268, 12863027320889786, 724874553417397463, 41005626962099741403, 2327182744071959475216, 132441294546405471753370
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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..1....0..1..2..0....0..1..0..2....0..0..1..0....0..1..0..2
..0..0..1..2....2..0..0..1....2..2..0..2....2..2..0..2....1..2..1..0
..0..0..0..1....0..0..2..1....1..0..1..0....1..1..2..1....1..2..2..2
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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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