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A222790
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Number of nX4 0..3 arrays with exactly floor(nX4/2) elements unequal to at least one horizontal or antidiagonal neighbor, with new values introduced in row major 0..3 order
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1
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3, 18, 275, 5896, 137804, 3315998, 80934417, 1992934141, 49390328481, 1230248849616, 30772191192457, 772421301648384, 19447340783043671, 490908234855685636, 12420271942780692035, 314872108569518327475
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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..0..1....0..1..1..1....0..0..0..1....0..0..1..2....0..1..2..0
..0..1..1..1....0..1..1..1....0..0..0..2....0..0..1..1....3..0..0..0
..1..1..1..1....1..1..1..0....0..0..0..2....1..1..1..1....0..0..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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