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A221779
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Number of nX4 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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21, 2631, 311500, 36959565, 4383899151, 519828193272, 61646570104772, 7310747898489930, 866987511530643810, 102816641533831938240, 12193094561710087236373, 1445987266172531006933514
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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..2..1..0....0..2..1..2....0..1..3..2....0..1..0..2....0..3..0..1
..1..2..0..0....0..1..0..2....1..0..0..1....0..1..2..0....1..0..0..3
..0..2..3..1....3..0..0..1....1..0..3..0....2..2..0..2....0..1..2..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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