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A221402
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Number of 3Xn arrays of occupancy after each element moves to some horizontal, diagonal or antidiagonal neighbor, with no 2-loops and with no occupancy greater than 2
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1
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0, 7, 30, 2110, 26374, 681300, 11554698, 239213277, 4414861636, 86099730502, 1625526991148, 31160102911062, 591775127780270, 11285743215972044, 214648325661089776, 4087126318623042490, 77761170034232040294
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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
..1..2..0....0..2..0....0..2..0....1..2..0....1..2..0....0..2..1....0..2..0
..0..2..1....0..2..1....2..2..0....0..2..2....0..2..0....0..2..1....1..2..0
..0..2..1....1..2..1....1..2..0....0..2..0....1..2..1....0..2..1....1..2..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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