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A264955
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Number of 3Xn arrays containing n copies of 0..3-1 with no equal horizontal or vertical neighbors.
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1
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6, 12, 36, 114, 420, 1584, 6228, 24930, 101376, 417504, 1734876, 7271238, 30667068, 130119672, 554721564, 2375331042, 10209040920, 44027206416, 190434749196, 825936571446, 3590858184996, 15646265986056, 68311732725204
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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
..2..1..0..2....0..2..0..2....0..1..2..1....0..2..1..2....1..0..1..2
..0..2..1..0....2..1..2..1....2..0..1..2....2..1..0..1....0..2..0..1
..2..1..0..1....1..0..1..0....0..1..2..0....0..2..1..0....2..0..1..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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