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A267727
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Number of 4Xn arrays containing n copies of 0..4-1 with every element equal to at least one horizontal neighbor and the top left element equal to 0.
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0
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0, 6, 6, 630, 1398, 93672, 609264, 20702760, 279681294, 7420195854, 149049265998, 3763960753368, 88917911372016
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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..3..3....0..0..1..1....0..0..2..2....0..0..2..2
..2..2..3..3....1..1..3..3....0..0..3..3....1..1..3..3....3..3..3..3
..2..2..1..1....2..2..0..0....2..2..3..3....0..0..3..3....2..2..0..0
..1..1..3..3....1..1..2..2....2..2..1..1....1..1..2..2....1..1..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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