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A219798
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Number of nX4 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 nX4 array
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1
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20, 21, 283, 1605, 9817, 52704, 279458, 1485408, 7898483, 41071878, 205411559, 983354244, 4524348747, 20138886182, 87167200173, 367779504535, 1513868192185, 6081577731882, 23858481057510, 91492233259175, 343337879987807
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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
..3..3..0..0....1..1..0..0....3..0..0..0....2..2..2..2....2..1..1..1
..3..3..0..0....1..1..0..0....3..0..0..0....2..2..2..2....0..0..0..1
..3..3..0..0....2..2..3..3....3..3..2..2....3..3..3..3....0..0..0..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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