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A267221
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Number of nX2 arrays containing 2 copies of 0..n-1 with no element 1 greater than its west, northeast or southeast neighbor modulo n and the upper left element equal to 0.
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0
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1, 0, 3, 35, 889, 52759, 4249084, 454920734, 62723579604, 10837409167674, 2294655530073038
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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..3....0..3....0..2....0..3....0..3....0..0....0..2....0..3....0..3....0..3
..2..1....2..2....1..0....2..0....3..1....2..2....2..1....2..1....1..1....2..2
..1..0....1..0....3..2....3..2....1..0....1..3....3..3....0..3....0..3....0..3
..3..2....3..1....1..3....1..1....2..2....3..1....1..0....2..1....2..2....1..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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