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A221657
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Number of 3Xn arrays of occupancy after each element moves to some horizontal, diagonal or antidiagonal neighbor, without move-in move-out left turns
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1
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0, 12, 230, 5879, 128076, 2853634, 63318470, 1408047450, 31296772948, 695652396949, 15461913567744, 343664536672236, 7638450184626910, 169775851711606490, 3773518891128106982, 83872027453458936923
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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
..1..2..0....0..2..2....0..3..1....0..1..0....0..2..2....1..0..1....1..1..0
..0..0..1....0..3..1....0..1..1....0..3..2....0..2..0....0..3..0....0..3..0
..1..4..0....0..1..0....0..2..1....1..2..0....1..2..0....1..3..0....2..2..0
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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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