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A265242
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Number of 3Xn arrays containing n copies of 0..3-1 with no equal antidiagonal neighbors and new values introduced sequentially from 0.
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1
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1, 10, 92, 888, 8880, 91180, 955320, 10168092, 109595168, 1193414004, 13106207640, 144965453160, 1613228920704, 18047090084256, 202816635014976, 2288462757997500, 25913609592575040, 294366270662992612
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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..0..0..0....0..0..1..0....0..1..1..1....0..1..0..2....0..0..1..1
..1..1..2..2....2..2..1..2....2..0..2..0....0..1..1..1....2..2..0..1
..2..1..1..2....1..2..1..0....2..0..2..1....2..2..0..2....0..1..2..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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