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A267552
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Number of n X n arrays containing n copies of 0..n-1 with every element equal to or 1 greater than any north or northeast neighbors modulo n and the upper left element equal to 0.
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1
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1, 3, 6, 15, 55, 279, 2033, 21772, 345843, 8152180, 287657713
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OFFSET
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1,2
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COMMENTS
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LINKS
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EXAMPLE
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Some solutions for n=4
..0..0..1..1....0..0..0..0....0..0..1..2....0..0..1..2....0..1..1..2
..0..1..2..2....1..1..1..1....1..1..2..3....1..1..2..3....1..1..2..3
..1..2..3..3....2..2..2..2....2..2..3..0....1..2..3..3....2..2..3..0
..2..3..3..0....3..3..3..3....3..3..0..1....2..3..0..0....3..3..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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