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A221767
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Number of nX6 arrays of occupancy after each element moves to some horizontal or vertical neighbor, without 2-loops or left turns
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0
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0, 55, 3125, 141177, 7115200, 347487163, 16949434757, 827634377153, 40390407683703, 1971106075073481, 96192307643812016, 4694244462294115117, 229081654358812855517, 11179298440465068878911
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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..1..0..1..1..0....1..1..1..0..1..1....0..1..1..1..0..1....1..1..1..1..1..1
..2..2..1..1..1..1....2..0..1..1..2..1....1..1..1..1..1..2....1..0..2..1..2..2
..1..1..1..1..1..1....1..1..2..1..1..0....1..1..2..1..1..1....1..0..1..0..1..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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