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A266879
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Number of 3Xn arrays containing n copies of 0..3-1 with no element 1 greater than its north, southwest or northwest neighbor modulo 3 and the upper left element equal to 0.
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2
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1, 1, 2, 5, 11, 26, 46, 121, 400, 1109, 2924, 7992, 21954, 61748, 176647, 499953, 1409763, 3999662, 11391787, 32574599, 93459472, 268336008, 771070141, 2219952038, 6403510479, 18502345738, 53538515560, 155090741042, 449731074132
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OFFSET
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1,3
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COMMENTS
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LINKS
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EXAMPLE
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All solutions for n=4
..0..2..2..1....0..2..1..0....0..0..2..1....0..2..1..1....0..1..2..0
..0..2..1..1....2..2..1..0....0..2..2..1....0..2..1..0....2..0..1..2
..0..2..1..0....2..1..1..0....0..2..1..1....2..2..1..0....1..2..0..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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