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A221390
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Number of 4Xn arrays of occupancy after each element moves to some horizontal or antidiagonal neighbor, with no 2-loops and with no occupancy greater than 2
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1
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0, 0, 13, 1198, 52320, 2204556, 86673898, 3361458245, 128992693561, 4928816080380, 187851827622672, 7150418585672281, 271982464009887803, 10341601574159713990, 393139667142067892978, 14943725056237306101598
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OFFSET
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1,3
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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..1....0..2..1....0..2..1....0..2..1....0..2..0....0..2..1....0..2..0
..0..2..1....0..2..1....0..2..0....1..2..1....1..2..1....1..2..1....1..2..1
..1..2..1....1..2..0....1..2..1....0..2..1....1..2..1....0..2..0....0..2..1
..0..2..0....1..2..0....1..2..0....0..2..0....0..2..0....1..2..0....1..2..0
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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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