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A230817
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Number of nX6 0..2 arrays x(i,j) with each element horizontally or vertically next to at least one element with value (x(i,j)+1) mod 3 and at least one element with value (x(i,j)-1) mod 3, and upper left element zero
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1
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0, 12, 326, 12210, 497166, 21835516, 888633610, 37511690680, 1575024801010, 65857595528130, 2767152819316108, 115921366835256538, 4863791239252964166, 203925622348965051300, 8552837284722587592810, 358663019377259939567606
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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=4
..0..1..2..1..0..2....0..2..1..0..2..1....0..2..0..1..2..0....0..1..2..0..2..1
..2..1..0..1..2..1....1..0..2..0..2..0....1..1..2..0..0..1....2..0..0..1..2..0
..0..1..2..0..0..0....2..0..2..1..1..1....2..0..0..1..2..2....1..0..0..2..1..0
..2..1..0..2..1..2....0..1..2..0..0..2....0..1..2..0..1..0....0..2..1..0..1..2
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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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