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A267790
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Number of 4Xn 0..1 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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1
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9, 81, 729, 5081, 34173, 211555, 1262760, 7263481, 40755550, 223936008, 1210708628, 6459502002, 34095465344, 178380596163, 926424208370, 4781950926795, 24555731443566, 125543243787981, 639444488484051
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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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FORMULA
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Empirical recurrence of order 93 (see link above)
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EXAMPLE
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Some solutions for n=4
..1..1..1..0....0..1..0..1....0..0..0..1....0..1..1..0....0..0..1..1
..0..0..0..0....1..0..1..0....0..1..0..1....0..0..0..1....1..0..1..0
..1..1..1..1....1..0..0..1....1..1..1..0....1..0..0..1....0..1..0..0
..0..1..0..0....0..1..0..1....0..0..0..1....1..1..1..0....0..1..1..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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