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A185555
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1/3 the number of nX5 0..2 arrays with every element equal to exactly one or two of its horizontal and vertical neighbors
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1
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5, 576, 25496, 1317540, 64354744, 3228500154, 160107914496, 7976049592892, 396657534279472, 19739291980979494, 982052247478709716, 48863217617236925408, 2431151644944154928564, 120961982929570366777114
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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 4X5 with a(1,1)=0
..0..0..0..1..2....0..0..1..1..0....0..0..1..2..2....0..0..0..1..1
..0..2..2..1..2....0..1..0..0..0....0..2..1..1..1....0..1..2..2..2
..0..1..2..0..0....0..1..1..2..1....0..2..0..0..2....0..1..1..0..0
..1..1..2..1..1....0..2..2..2..1....2..2..1..1..2....0..2..2..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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