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A221771
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Number of nX4 arrays of occupancy after each element stays put or moves to some horizontal or vertical neighbor, without move-in move-out left turns
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0
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21, 2127, 225873, 23965217, 2541024755, 269350655878, 28548644230368, 3025789208683568, 320691065003362685, 33988597488799369041, 3602292346906129492849
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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
..0..1..0..2....1..1..0..0....0..3..0..0....0..1..1..2....0..1..0..1
..1..1..0..1....1..1..2..2....1..3..0..1....1..2..1..0....0..2..1..2
..0..3..3..0....0..0..4..0....1..1..1..1....1..1..2..0....1..3..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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