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 A265058 Coordination sequence for (2,3,8) tiling of hyperbolic plane. 27
 1, 3, 5, 7, 9, 12, 16, 21, 27, 33, 40, 49, 61, 76, 94, 116, 142, 174, 214, 264, 326, 401, 493, 606, 745, 917, 1129, 1390, 1710, 2103, 2587, 3183, 3917, 4820, 5931, 7297, 8977, 11045, 13590, 16722, 20575, 25315, 31147, 38322, 47151, 58015, 71382, 87828, 108062, 132958, 163590, 201280, 247654 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 LINKS G. C. Greubel, Table of n, a(n) for n = 0..1000 J. W. Cannon, P. Wagreich, Growth functions of surface groups, Mathematische Annalen, 1992, Volume 293, pp. 239-257. See Prop. 3.1. Index entries for linear recurrences with constant coefficients, signature (0, 0, 1, 0, 1, 0, 1, 0, 0, -1). FORMULA G.f.: (x+1)^2*(x^2+x+1)*(x^6+x^4+x^2+1)/(x^10-x^7-x^5-x^3+1). MATHEMATICA CoefficientList[Series[(x + 1)^2 (x^2 + x + 1) (x^6 + x^4 + x^2 + 1)/(x^10 - x^7 - x^5 - x^3 + 1), {x, 0, 60}], x] (* Vincenzo Librandi, Dec 30 2015 *) PROG (PARI) x='x+O('x^50); Vec((x+1)^2*(x^2+x+1)*(x^6+x^4+x^2+1)/(x^10-x^7-x^5-x^3+1)) \\ G. C. Greubel, Aug 06 2017 CROSSREFS Coordination sequences for triangular tilings of hyperbolic space: A001630, A007283, A054886, A078042, A096231, A163876, A179070, A265057, A265058, A265059, A265060, A265061, A265062, A265063, A265064, A265065, A265066, A265067, A265068, A265069, A265070, A265071, A265072, A265073, A265074, A265075, A265076, A265077. Sequence in context: A265057 A122643 A194240 * A265059 A349828 A096231 Adjacent sequences: A265055 A265056 A265057 * A265059 A265060 A265061 KEYWORD nonn,easy AUTHOR N. J. A. Sloane, Dec 29 2015 STATUS approved

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Last modified April 16 05:35 EDT 2024. Contains 371697 sequences. (Running on oeis4.)