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A209212
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Number of nX1 1..7 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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0, 1, 1, 3, 3, 16, 24, 114, 202, 763, 1401, 4515, 9434, 27254, 63839, 176658, 434102, 1150983, 2879410, 7477003, 18723697, 48021192, 121277594, 311110891, 788523859, 2015924491, 5129396865, 13105869640, 33306947102, 84824346802, 215681934014
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OFFSET
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1,4
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COMMENTS
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LINKS
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EXAMPLE
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All solutions for n=6
..5....1....5....1....1....2....3....4....4....2....5....3....4....2....2....3
..2....1....3....1....1....2....1....1....4....2....1....3....2....3....4....4
..2....2....1....1....3....2....1....1....1....2....1....3....3....2....2....2
..2....2....1....1....1....2....3....2....1....2....1....3....2....2....1....3
..2....2....3....1....1....1....1....4....4....2....1....3....4....3....1....2
..5....2....5....1....3....1....1....2....4....2....5....3....3....2....4....4
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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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