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A221739
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Number of 4Xn arrays of occupancy after each element stays put or moves to some horizontal or antidiagonal neighbor, without move-in move-out left turns
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0
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1, 489, 54888, 5962648, 635754537, 67528875354, 7163909304549, 759566587771238, 80515544879207321, 8533986434770695295, 904498107089443489067, 95864312683893293318311, 10160235943126188410457063
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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..1..1....0..1..0....1..1..3....0..1..2....0..2..3....1..0..1....1..2..1
..0..2..2....2..1..1....0..1..2....2..2..0....0..0..1....2..2..0....0..1..1
..0..0..2....2..2..0....0..0..0....1..1..0....2..0..2....2..0..1....0..2..1
..1..0..2....0..3..0....1..3..0....1..2..0....1..0..1....2..1..0....0..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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