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A221738
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Number of 3Xn arrays of occupancy after each element stays put or moves to some horizontal or antidiagonal neighbor, without move-in move-out left turns
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1
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1, 91, 2904, 89920, 2756353, 84394752, 2583450288, 79076354944, 2420345277285, 74080136453919, 2267377897799414, 69397723169867694, 2124057415530302013, 65011050835979200659, 1989793867498843870414, 60901638841473991347603
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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
..2..0..0....0..1..2....0..3..1....1..1..0....0..1..1....1..2..0....0..2..0
..2..1..1....1..1..0....1..1..0....1..2..1....1..3..0....0..2..2....2..2..0
..0..3..0....1..2..1....2..0..1....1..1..1....2..1..0....1..1..0....0..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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