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

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Last modified May 22 16:56 EDT 2013. Contains 225553 sequences.