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A266043
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Number of 3Xn arrays containing n copies of 0..3-1 with no element plus any vertical or antidiagonal neighbor equal to 3-1.
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1
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2, 8, 30, 146, 620, 3018, 14356, 72070, 366704, 1914616, 10149476, 54660630, 297665832, 1637684396, 9080967528, 50697416118, 284611241532, 1605400483260, 9092172075452, 51674059356836, 294578579777600, 1683830972093940
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OFFSET
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1,1
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COMMENTS
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LINKS
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EXAMPLE
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Some solutions for n=4
..2..0..0..2....0..1..2..0....2..2..1..0....2..0..2..0....2..1..1..1
..1..1..1..1....0..2..1..1....2..2..0..0....1..1..1..1....2..2..0..0
..2..0..0..2....1..2..2..0....1..1..0..1....0..0..2..2....2..1..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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