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A223049
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Number of nX3 0..3 arrays with exactly floor(nX3/2) elements equal to at least one horizontal, diagonal or antidiagonal neighbor, with new values introduced in row major 0..3 order
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1
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0, 44, 1682, 101573, 4505726, 286019636, 13029003006, 847775163675, 39163069348499, 2586615582072818, 120546656751917002, 8041164730409837733, 377031919338288517436, 25328506526109972349940, 1192869061178928489347148
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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..0..0....0..1..1....0..1..2....0..1..2....0..1..0....0..0..1
..2..3..2....1..0..2....2..1..0....2..2..3....3..2..2....2..3..1....2..1..3
..0..0..1....1..0..3....2..3..1....0..2..1....2..1..0....2..0..3....3..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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