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A266652
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Number of nX2 arrays containing 2 copies of 0..n-1 with no element 1 greater than its northeast neighbor modulo n and the upper left element equal to 0.
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0
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1, 1, 11, 234, 8466, 465690, 36290610, 3806425980, 517149634680, 88352470838520, 18539220178017000, 4687139017126566000
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OFFSET
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1,3
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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..1....0..1....0..0....0..3....0..3....0..2....0..3....0..1....0..3....0..1
..3..2....0..1....2..1....2..3....1..0....1..3....3..2....3..0....2..1....1..2
..0..1....3..2....3..3....2..1....2..3....2..1....1..2....2..3....1..0....2..0
..3..2....2..3....2..1....0..1....1..2....0..3....1..0....2..1....2..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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