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A265854
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Number of nX2 arrays containing 2 copies of 0..n-1 with no element plus any horizontal or antidiagonal neighbor equal to n-1.
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0
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0, 0, 10, 248, 14928, 829824, 90999072, 9589855104, 1679970554880, 287741257800960, 73925012711635200, 18719082274603622400
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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
..1..3....2..2....3..2....3..2....0..1....3..1....0..1....3..1....2..2....0..0
..2..2....3..1....0..2....0..2....3..2....3..1....0..2....3..2....3..3....1..1
..3..1....3..1....0..1....3..1....2..0....0..2....2..3....0..1....1..0....3..2
..0..0....0..0....1..3....0..1....1..3....2..0....3..1....0..2....1..0....3..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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