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A220999
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Number of nX4 arrays of occupancy after each element stays put or moves to some horizontal or vertical neighbor
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1
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21, 2989, 394580, 51672851, 6758547145, 883809591160, 115571009291599, 15112491898694315, 1976162121051496204, 258409744432367037405, 33790541796768618273627, 4418566652828051992947794
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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..1..1....0..4..2..0....0..2..1..2....0..2..1..2....0..2..1..0
..0..3..1..1....1..0..0..1....1..0..0..3....0..3..0..2....0..3..0..2
..1..2..0..1....0..2..1..1....1..2..0..0....0..1..0..1....0..1..1..2
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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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