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A221600
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Number of nX2 arrays of occupancy after each element moves to some king-move neighbor, without move-in move-out left turns
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1
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1, 19, 140, 1206, 10020, 84160, 705156, 5912277, 49563492, 415515336, 3483440165, 29203220338, 244823382148, 2052461910954, 17206688780344, 144251223226490, 1209321306131007, 10138271200549217, 84993576475914931, 712538449541938001
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OFFSET
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1,2
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COMMENTS
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LINKS
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EXAMPLE
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Some solutions for n=3
..0..0....0..0....1..1....1..2....2..1....0..1....0..2....1..0....0..2....1..1
..1..2....1..3....3..1....1..2....0..1....0..2....2..0....4..0....1..2....0..3
..1..2....0..2....0..0....0..0....1..1....1..2....1..1....1..0....1..0....0..1
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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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