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A265451
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Number of n X 1 0..n+1-2 arrays with each element differing from its horizontal and vertical neighbors by one or two.
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1
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1, 1, 2, 12, 66, 360, 1864, 9358, 45642, 217590, 1017626, 4684896, 21284488, 95624666, 425523864, 1878025074, 8229470812, 35836393568, 155196577484, 668832795812, 2869861291134, 12266161148622, 52243167132940, 221803857150698, 938974990229088, 3964558585350392
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OFFSET
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0,3
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LINKS
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EXAMPLE
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Some solutions for n=4
..3....3....1....2....2....0....3....0....0....1....2....2....1....0....0....3
..2....1....2....0....1....1....1....1....2....3....3....0....0....1....1....2
..3....2....1....2....0....3....0....0....1....2....2....1....1....3....2....0
..2....1....3....1....1....2....1....1....0....1....0....2....2....1....0....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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EXTENSIONS
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STATUS
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approved
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