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A221299
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Number of nX4 arrays of occupancy after each element stays put or moves to some horizontal or vertical neighbor, with no occupancy greater than 2
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1
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17, 1001, 63285, 4119299, 270434991, 17788952657, 1170461488239, 77011254247993, 5066792859597385, 333350527345443633, 21931251172817255263, 1442854892820284178311, 94924922041346379554607
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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..1..2..2....2..1..0..2....0..1..1..0....1..0..0..2....2..1..2..0
..2..0..1..2....0..1..1..0....1..1..2..2....1..1..0..2....0..1..2..1
..1..1..0..0....1..1..2..1....1..1..1..1....1..2..2..0....2..0..0..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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