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A267399
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Number of 6Xn arrays containing n copies of 0..6-1 with every element equal to or 1 greater than any north, west or northeast neighbors modulo 6 and the upper left element equal to 0.
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0
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1, 2, 5, 12, 36, 135, 649, 4189, 33828, 296985, 2634316, 22670355, 186406508, 1469990541, 11163446754, 82316060070
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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..1....0..0..1..1....0..0..0..0....0..0..0..1....0..0..1..2
..0..1..1..2....0..1..2..2....1..1..1..1....1..1..1..2....1..1..2..3
..1..2..2..3....1..2..3..3....2..2..2..2....2..2..2..3....1..2..3..4
..2..3..3..4....2..3..4..4....3..3..3..3....3..3..3..4....2..3..4..5
..3..4..4..5....3..4..5..5....4..4..4..4....4..4..4..5....3..4..5..5
..4..5..5..5....4..5..5..0....5..5..5..5....5..5..5..0....4..5..0..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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