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A219805
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Number of 4Xn arrays of the minimum value of corresponding elements and their horizontal, vertical, diagonal 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, 26, 255, 1605, 8779, 43246, 202771, 925422, 4126107, 17906335, 75378166, 307556583, 1218294836, 4697943812, 17681747822, 65077780434, 234502581210, 827942963501, 2865918328654, 9732510738469, 32448992255590, 106298597073959
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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
..0..0..0....0..0..0....1..0..0....2..0..0....1..0..0....0..0..0....2..0..0
..0..0..0....0..0..0....1..0..0....2..0..0....1..0..0....0..0..0....2..0..0
..2..1..1....0..0..0....1..1..1....2..1..1....2..2..2....0..0..0....3..0..0
..2..2..3....0..0..0....2..2..2....2..1..1....2..2..3....3..0..0....3..3..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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