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A221549
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Number of nX3 arrays of occupancy after each element moves to some horizontal, vertical or antidiagonal neighbor, without move-in move-out left turns
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1
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2, 72, 1930, 47976, 1196232, 29856238, 745144793, 18597229593, 464150326595, 11584303335876, 289122180321148, 7215940813826595, 180096192359343564, 4494859317429619337, 112183162016821282782, 2799878918782194289254
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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
..1..0..0....0..2..1....1..1..0....0..1..0....2..1..0....1..0..2....2..1..0
..1..1..1....0..3..2....0..2..1....1..3..1....0..2..0....1..2..2....0..0..1
..1..4..0....0..0..1....2..1..1....2..0..1....2..2..0....0..1..0....1..4..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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