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A267223
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Number of 3Xn arrays containing n copies of 0..3-1 with no element 1 greater than its west, northeast or southeast neighbor modulo 3 and the upper left element equal to 0.
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1
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2, 3, 8, 17, 34, 68, 164, 385, 826, 1848, 4450, 10544, 24056, 56108, 135672, 324720, 762864, 1818110, 4413518, 10641004, 25427616, 61338160, 149415144, 362365684, 875207554, 2127235158, 5197934580, 12666448776, 30813494386, 75278796468
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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..0..2..1....0..2..1..1....0..2..1..1....0..2..1..1....0..2..1..0
..2..1..0..2....2..1..0..2....1..0..0..2....2..1..0..2....1..0..2..1
..1..0..2..1....0..2..1..0....2..2..1..0....0..0..2..1....2..1..0..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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