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A265452
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Number of nX2 0..n+2-2 arrays with each element differing from its horizontal and vertical neighbors by one or two.
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1
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2, 18, 250, 3358, 42282, 502154, 5710302, 62782966, 672520310, 7056533978, 72819524370, 741279145398, 7460955607878, 74381377429158, 735539563061590, 7222916531541006, 70499118369836786, 684459097597365542
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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=4
..1..2....3..1....1..0....4..3....3..2....2..3....2..0....1..3....4..2....3..2
..2..3....4..2....0..2....2..1....2..1....3..4....0..1....2..4....3..1....1..0
..1..2....2..1....2..3....1..3....1..2....4..2....1..2....1..2....1..3....0..1
..3..4....1..3....3..1....0..1....3..4....2..1....2..3....2..1....3..1....2..3
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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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