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A230617
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Number of 5Xn 0..2 arrays x(i,j) with each element horizontally or antidiagonally 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, 0, 0, 3956, 186396, 9244260, 434369516, 20503681466, 966773847580, 45581787186432, 2149180036524206, 101333194960896292, 4777826219804545032, 225273040322769534304, 10621553459907019602010, 500802937807938817926738
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OFFSET
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1,4
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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..0....0..1..1..2....0..1..2..0....0..1..2..1....0..1..1..2
..2..0..1..2....2..0..0..1....0..2..1..0....0..0..2..1....2..0..0..2
..1..2..0..1....1..2..2..1....1..2..0..1....1..2..0..2....0..1..2..0
..1..0..2..2....1..0..2..1....2..0..2..1....1..0..2..2....0..2..1..1
..0..1..0..2....2..2..0..2....1..2..0..2....2..1..0..2....2..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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