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 A209547 1/4 the number of (n+1)X3 0..3 arrays with every 2X2 subblock having exactly two distinct clockwise edge differences 1
 20, 105, 562, 3051, 16582, 90186, 490547, 2668340, 14514612, 78953457, 429474356, 2336164666, 12707780399, 69125130364, 376012453568, 2045354053809, 11125890031368, 60520294171670, 329205663240431, 1790744248612872 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Column 2 of A209553 LINKS R. H. Hardin, Table of n, a(n) for n = 1..210 Index entries for linear recurrences with constant coefficients, signature (8,-14,-3,20,-8,-2). FORMULA Empirical: a(n) = 8*a(n-1) -14*a(n-2) -3*a(n-3) +20*a(n-4) -8*a(n-5) -2*a(n-6) EXAMPLE Some solutions for n=4 ..1..0..1....2..3..2....0..2..0....1..2..3....0..1..2....1..0..1....2..3..0 ..0..1..0....3..2..3....2..0..2....0..1..2....1..2..3....2..3..2....1..0..3 ..1..2..3....2..1..0....0..2..0....3..2..3....0..3..2....3..2..3....0..1..2 ..0..1..0....1..0..1....2..0..2....0..1..2....3..0..1....2..3..2....3..2..1 ..1..0..1....2..3..2....0..2..0....1..2..1....0..3..2....1..0..1....2..3..2 MATHEMATICA LinearRecurrence[{8, -14, -3, 20, -8, -2}, {20, 105, 562, 3051, 16582, 90186}, 30] (* Harvey P. Dale, Mar 11 2015 *) CROSSREFS Sequence in context: A181703 A187756 A248087 * A278642 A135174 A173963 Adjacent sequences:  A209544 A209545 A209546 * A209548 A209549 A209550 KEYWORD nonn AUTHOR R. H. Hardin Mar 10 2012 STATUS approved

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Last modified April 4 07:32 EDT 2020. Contains 333213 sequences. (Running on oeis4.)