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 A159617 G.f.: (1-x)/(1-8*x-8*x^2+8*x^3). 2
 1, 7, 64, 560, 4936, 43456, 382656, 3369408, 29668864, 261244928, 2300355072, 20255449088, 178356473856, 1570492542976, 13828748541952, 121767076888576, 1072202663100416, 9441127931576320, 83132508142305280, 732011467286249472 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 COMMENTS Number of tilings of a 2xn board with squares of 2 colors and dominoes of 2 colors if n>2. The number of tilings is 6 if n=1, and 56 if n=2. LINKS Vincenzo Librandi, Table of n, a(n) for n = 0..1000 M. Katz, C. Stenson, Tiling a 2xn-board with squares and dominoes, J. Int. Seq. 12 (2009) # 09.2.2 MATHEMATICA CoefficientList[Series[(1 - x)/(1 - 8 x - 8 x^2 + 8 x^3), {x, 0, 40}], x] (* Vincenzo Librandi, Dec 11 2012 *) CROSSREFS Cf. A030186, A102436, A159616. Sequence in context: A136955 A027767 A055537 * A098307 A055995 A213515 Adjacent sequences:  A159614 A159615 A159616 * A159618 A159619 A159620 KEYWORD nonn,easy AUTHOR R. J. Mathar, Apr 17 2009 STATUS approved

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