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A221797
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Number of nX4 arrays of occupancy after each element moves to some horizontal or vertical neighbor, without move-in move-out straight through or left turns
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1
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1, 39, 207, 3074, 26770, 308070, 3072428, 33022374, 341503872, 3603418695, 37628839684, 395070947793, 4136321868326, 43369462014426, 454388947033525, 4762556310357090, 49907461663171892, 523040952733010374
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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
..0..1..1..2....0..2..1..1....0..2..0..2....1..1..1..2....1..1..1..1
..1..2..0..1....1..2..0..1....1..1..1..1....2..1..0..1....1..2..0..1
..1..1..1..1....1..1..1..1....2..0..2..0....1..0..1..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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