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A230273
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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 upper left element zero
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1
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0, 108, 19996, 2348840, 261026756, 28716109350, 3159756711522, 347321368287746, 38183785495750352, 4197613545581221410, 461451167556083194646, 50728172936710501676214, 5576636888940842482458762
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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
..0..2..1..2..0..1....0..1..0..2..1..2....0..1..0..0..2..1....0..1..1..2..1..2
..1..1..2..0..1..2....1..2..2..1..2..0....2..2..0..1..1..0....2..2..1..0..0..0
..2..0..1..2..1..0....0..0..1..0..2..1....0..1..2..2..0..2....1..0..1..2..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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