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A222751
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Number of 4Xn 0..3 arrays with exactly floor(4Xn/2) elements equal 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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0, 685, 125094, 27397461, 5989744766, 1324592085403, 294955698998860, 66064733675822897, 14869951771796014493, 3360970838387265054462, 762388660819620686155665, 173472790844083347576048482
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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..1....0..1..1....0..1..0....0..1..1....0..1..0....0..1..1....0..1..2
..1..0..2....0..2..0....1..1..1....2..1..0....2..3..3....0..1..0....1..1..0
..1..1..0....3..1..2....2..0..0....0..2..0....2..1..1....1..2..1....2..1..1
..1..2..3....1..2..3....1..2..1....3..0..0....3..1..1....2..0..1....3..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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