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A269507
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Number of 3Xn arrays containing n copies of 0..3-1 avoiding the pattern down-up in every row and column.
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1
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4, 54, 420, 3088, 25226, 239994, 2338286, 23240168, 232006814, 2352889414, 24069853302, 248560741574, 2582277394354, 26997628173380, 283652378887212, 2994183763030920, 31727834772912212, 337396544704648686
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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
..1..1..2..0. .1..0..0..1. .0..0..2..1. .0..0..2..2. .0..1..2..1
..1..1..2..2. .2..1..1..2. .0..2..2..1. .1..2..1..1. .0..2..2..1
..0..0..0..2. .0..2..2..0. .2..1..1..0. .1..2..0..0. .2..0..0..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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