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A221926
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Number of nX3 arrays of occupancy after each element stays put or moves to some horizontal, diagonal or antidiagonal neighbor, without move-in move-out straight through or left turns
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1
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6, 232, 5748, 153652, 4053833, 107220027, 2834169558, 74925759485, 1980733759947, 52362769529788, 1384263535086577, 36594432454954146, 967411477937300180, 25574518045138377146, 676088703977133126785
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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..0....0..1..1....1..2..0....0..3..0....0..4..1....0..1..1....0..2..1
..0..1..1....1..3..0....1..2..1....0..2..1....0..1..0....0..5..0....0..2..2
..2..2..1....2..1..0....1..1..0....0..1..2....1..1..1....2..0..0....0..1..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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