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A217224
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Number of nX4 arrays of occupancy after each element moves to some horizontal or vertical neighbor, with no 2-loops and with no occupancy greater than 2
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1
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0, 38, 1648, 67956, 2662621, 102825095, 3940138931, 150405053021, 5729680653464, 218036689302796, 8292350386134653, 315276121028319608, 11984839981037388864, 455548467001108257477, 17314744679135811905542
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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..0..2..1....1..2..0..0....1..0..0..0....0..0..2..1....1..2..1..0
..2..2..2..2....2..1..0..1....2..2..2..2....2..1..1..2....1..2..1..2
..0..0..0..1....1..1..2..1....1..1..0..1....0..1..1..1....0..1..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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