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A265860
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Number of nX2 arrays containing 2 copies of 0..n-1 with no element plus any vertical neighbor equal to n-1.
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1
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1, 2, 22, 384, 19080, 1019328, 106546608, 11075595648, 1892644922880, 321721729436160, 81376293539485440, 20506177206967265280
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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..3....3..2....3..0....1..3....1..2....2..1....3..1....1..2....0..1....3..2
..0..3....3..2....1..0....1..2....0..0....2..3....2..1....3..2....1..0....1..0
..1..2....1..0....3..2....3..0....2..1....0..1....0..3....3..0....3..2....1..0
..1..2....0..1....1..2....2..0....3..3....0..3....0..2....1..0....2..3....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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