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A221782
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Number of 3Xn arrays of occupancy after each element stays put or moves to some horizontal, diagonal or antidiagonal neighbor, without move-in move-out left turns
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1
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1, 184, 7676, 311500, 12449782, 496125037, 19763197787, 787085360643, 31344203790093, 1248188259617209, 49704848595150246, 1979319928404980888, 78819337675566218873, 3138697184284703490208, 124987334716559797042649
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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..3..1....1..1..1....1..2..2....2..0..0....0..0..0....0..3..2....2..0..0
..1..1..2....0..1..0....0..0..0....0..4..0....1..2..1....0..3..0....2..3..0
..1..0..0....1..4..0....0..3..1....1..2..0....3..2..0....1..0..0....2..0..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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