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A267625
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Number of nX2 arrays containing 2 copies of 0..n-1 with every element equal to or 1 greater than any west neighbor modulo n and the upper left element equal to 0.
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0
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1, 3, 7, 27, 138, 900, 7110, 66150, 708120, 8573040, 115781400, 1725154200, 28103922000, 496799503200, 9469060801200, 193546022670000
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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..1....0..0....0..1....0..0....0..0....0..1....0..1....0..0....0..1....0..1
..3..3....3..3....2..3....1..1....3..3....2..3....2..3....1..1....3..0....3..3
..0..1....1..2....1..2....2..3....1..1....2..3....0..1....3..3....1..2....2..2
..2..2....1..2....3..0....2..3....2..2....0..1....2..3....2..2....2..3....0..1
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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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