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A206143
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Number of (n+1)X2 0..2 arrays with every 2X3 or 3X2 subblock having exactly three anticlockwise and three clockwise edge increases
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1
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81, 60, 162, 486, 1458, 4374, 13122, 39366, 118098, 354294, 1062882, 3188646, 9565938, 28697814, 86093442, 258280326, 774840978, 2324522934, 6973568802, 20920706406, 62762119218, 188286357654, 564859072962, 1694577218886
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OFFSET
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1,1
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COMMENTS
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Column 1 of A206150
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LINKS
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R. H. Hardin, Table of n, a(n) for n = 1..210
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FORMULA
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Empirical: a(n) = 3*a(n-1) for n>3
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EXAMPLE
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Some solutions for n=4
..1..2....0..2....2..1....2..1....2..0....1..2....2..1....1..2....0..2....1..2
..0..1....1..0....0..2....0..2....0..1....2..0....0..2....2..1....1..0....2..0
..1..0....2..1....2..0....1..0....2..0....0..1....1..0....0..2....2..1....1..2
..0..2....0..2....1..2....2..1....0..2....2..0....2..1....1..0....1..0....0..1
..2..0....2..1....2..0....1..2....1..0....1..2....1..0....2..1....0..1....1..2
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CROSSREFS
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Sequence in context: A033401 A143756 A206150 * A087410 A177842 A075691
Adjacent sequences: A206140 A206141 A206142 * A206144 A206145 A206146
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KEYWORD
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nonn
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AUTHOR
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R. H. Hardin Feb 04 2012
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STATUS
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approved
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