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A266452
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Number of nX2 arrays containing 2 copies of 0..n-1 with no element 1 greater than its north neighbor modulo n and the upper left element equal to 0.
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1
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1, 1, 5, 101, 3417, 184881, 14216101, 1477674733, 199405047857, 33889007175041, 7081268215880805, 1784184251089927605
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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..0....0..2....0..3....0..3....0..3....0..2....0..3....0..2....0..1
..2..3....3..3....2..0....0..3....2..3....0..1....3..0....2..3....2..1....3..1
..0..1....1..2....1..3....2..1....2..1....2..1....1..3....1..2....1..3....2..3
..2..3....1..2....3..1....2..1....1..0....2..3....1..2....0..1....0..3....0..2
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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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