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A209363
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Number of nX4 1..3 arrays with every element value z a city block distance of exactly z from another element value z
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1
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3, 122, 10796, 804545, 42033202, 2043431891, 95757163046, 4450804913246, 208608618878322, 9821357826542694, 464584671831559050, 22043049977515754013, 1047048789075528283907, 49710984903586449661602
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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
..3..1..2..2....2..1..1..3....1..1..2..2....1..3..1..2....3..2..3..3
..1..1..3..3....3..2..2..2....2..1..2..2....1..2..1..2....2..1..1..3
..2..3..2..2....3..2..3..3....2..1..2..2....1..2..3..2....3..3..1..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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