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A221820
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Number of 4Xn arrays of occupancy after each element moves to some horizontal, diagonal or antidiagonal neighbor, without move-in move-out straight through or left turns
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0
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0, 40, 379, 29412, 854959, 35948127, 1290833232, 49447514716, 1844208808987, 69554410132666, 2610306743813999, 98167800387966673
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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..1....1..1..0....1..2..0....0..2..0....1..3..1....1..0..0....0..2..1
..0..2..0....0..2..1....0..2..1....1..2..1....0..1..0....0..3..1....0..3..0
..0..1..0....1..3..0....1..1..1....0..1..1....1..2..0....1..3..0....2..3..1
..1..3..1....1..2..0....0..3..0....1..3..0....1..2..0....1..2..0....0..0..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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