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A266922
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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 southeast neighbor modulo 3 and the upper left element equal to 0.
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1
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1, 4, 8, 22, 54, 142, 368, 974, 2596, 6978, 18956, 51750, 142624, 394594, 1099946, 3076470, 8654090, 24416490, 69188320, 196569386, 560336468, 1600901762, 4585812858, 13161785906, 37855003558, 109058776534, 314733656956
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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=7
..0..2..1..0..2..0..1....0..2..1..2..0..1..2....0..1..2..0..2..1..2
..0..1..0..2..1..2..1....0..1..0..1..2..0..1....2..0..1..2..1..0..1
..2..1..2..1..0..2..0....2..1..2..0..1..2..0....1..2..0..1..0..2..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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