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A267977
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Number of 3Xn 0..3 arrays with every repeated value in every row greater than or equal to, and in every column greater than, the previous repeated value.
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2
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60, 3600, 216000, 12067722, 648144348, 33600202086, 1691726672094, 83078866656672, 3993019853352132, 188338933978296900, 8737015871231173194, 399355062781386269430, 18013039522804400997948, 802791844156171633174662
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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=2
..1..0....1..2....0..3....1..1....3..2....1..0....3..0....3..2....2..0....3..1
..0..2....2..2....1..1....3..2....3..2....3..3....1..3....2..2....0..1....3..0
..3..2....1..0....3..3....0..2....1..3....0..0....0..0....3..3....0..3....2..3
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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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