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A222718
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Number of nX2 0..3 arrays with exactly floor(nX2/2) elements equal to at least one horizontal, vertical or antidiagonal neighbor, with new values introduced in row major 0..3 order
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1
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0, 6, 30, 666, 6524, 103378, 1250904, 17976376, 235892592, 3296371800, 44713314784, 621198984864, 8554092568512, 118954438125472, 1651089670102400, 23021868920182656, 321109217833684736, 4490028930013194112
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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..1....0..1....0..0....0..1....0..1....0..1....0..1....0..0....0..1....0..1
..2..1....2..3....1..0....1..1....0..2....0..0....1..1....0..1....1..1....2..2
..1..3....2..2....2..1....2..3....0..3....1..2....2..0....2..0....0..2....1..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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