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A208297
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Number of nX3 nonnegative integer arrays with new values 0 upwards introduced in row major order and no element equal to any horizontal or antidiagonal neighbor (colorings ignoring permutations of colors)
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2
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2, 42, 2906, 433252, 113503692, 46538017584, 27700815674032, 22702140562948192, 24626774613248937584, 34296243004533645925408, 59839415643338575851475744, 128222446504879248765189962560, 331858429902640216546970620625280
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OFFSET
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1,1
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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..1..0....0..1..2....0..1..0....0..1..0....0..1..2....0..1..2
..0..1..0....0..1..0....0..1..2....0..1..0....2..3..0....0..3..1....0..3..0
..0..1..0....2..1..2....0..1..0....0..1..0....0..2..0....0..2..0....0..1..0
..0..2..1....0..1..0....0..1..0....0..1..0....0..1..0....3..1..0....0..3..0
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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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