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A220013
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Number of 4Xn arrays of the minimum value of corresponding elements and their horizontal, vertical or antidiagonal neighbors in a random, but sorted with lexicographically nondecreasing rows and nonincreasing columns, 0..3 4Xn array
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1
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20, 58, 560, 4474, 29055, 172143, 983187, 5489377, 29766873, 155831210, 787372571, 3852104643, 18307862344, 84697562976, 381831482922, 1679012288699, 7209808373614, 30272302102169, 124439451139499, 501340832583866
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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=3
..1..0..0....1..0..0....0..0..0....1..0..0....2..1..1....0..0..0....2..0..0
..0..0..0....1..0..0....0..0..0....1..0..0....1..1..1....0..0..0....2..0..0
..0..0..1....2..2..3....2..0..0....2..0..0....1..1..1....1..1..1....2..2..0
..2..2..3....2..3..3....0..0..0....3..0..0....3..3..3....1..1..2....2..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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