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A232364
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Number of n X 4 0..2 arrays with every 0 next to a 1 and every 1 next to a 2 horizontally or vertically.
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1
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15, 887, 39321, 1704619, 74665511, 3271362341, 143280358783, 6275473692531, 274859698649841, 12038586622802263, 527278170826443931, 23094261763297231417, 1011505808556752689163, 44302953319140331180267
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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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FORMULA
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Empirical recurrence of order 60 (see link above)
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EXAMPLE
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Some solutions for n=3
..1..2..2..2....2..2..0..1....1..2..1..2....0..1..2..2....1..0..1..2
..0..2..1..0....1..1..2..2....2..1..1..2....1..0..1..2....2..2..2..2
..2..1..1..2....2..1..0..1....1..0..0..1....2..2..2..2....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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