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A219581
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Number of 4Xn arrays of the minimum value of corresponding elements and their horizontal or vertical 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, 181, 2234, 18564, 140884, 1052190, 7579137, 51585784, 331270888, 2024909124, 11885134942, 67329174131, 369027185265, 1959956349517, 10103702621330, 50645615019582, 247273236084923, 1177685989979054, 5478135751536604
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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
..2..2..0....1..0..0....0..0..0....2..1..1....2..1..1....0..0..0....0..0..0
..3..0..0....0..0..0....1..0..0....1..1..1....3..2..1....0..0..0....0..0..0
..3..0..0....2..0..0....3..0..0....2..1..1....3..2..2....1..0..0....0..0..0
..3..1..0....1..0..0....3..2..0....3..2..1....3..2..2....1..2..1....3..3..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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