This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A265076 #19 Feb 20 2024 16:50:41
%S A265076 1,3,6,11,20,35,60,103,178,307,528,909,1566,2697,4644,7997,13772,
%T A265076 23717,40842,70333,121120,208579,359190,618555,1065204,1834371,
%U A265076 3158940,5439959,9368066,16132595,27781680,47842381,82388590,141880057,244329348,420755613,724576428,1247781333,2148784026,3700386173,6372375104
%N A265076 Coordination sequence for (3,5,5) tiling of hyperbolic plane.
%H A265076 G. C. Greubel, <a href="/A265076/b265076.txt">Table of n, a(n) for n = 0..1000</a>
%H A265076 J. W. Cannon, P. Wagreich, <a href="http://dx.doi.org/10.1007/BF01444714">Growth functions of surface groups</a>, Mathematische Annalen, 1992, Volume 293, pp. 239-257. See Prop. 3.1.
%H A265076 <a href="/index/Rec#order_06">Index entries for linear recurrences with constant coefficients</a>, signature (1, 0, 2, 0, 1, -1).
%F A265076 G.f.: (x^2+x+1)*(x^4+x^3+x^2+x+1)/(x^6-x^5-2*x^3-x+1).
%t A265076 CoefficientList[Series[(x^2 + x + 1) (x^4 + x^3 + x^2 + x + 1)/(x^6 - x^5 - 2 x^3 - x + 1), {x, 0, 60}], x] (* _Vincenzo Librandi_, Dec 30 2015 *)
%o A265076 (PARI) Vec((x^2+x+1)*(x^4+x^3+x^2+x+1)/(x^6-x^5-2*x^3-x+1) + O(x^50)) \\ _Michel Marcus_, Dec 30 2015
%Y A265076 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.
%K A265076 nonn,easy
%O A265076 0,2
%A A265076 _N. J. A. Sloane_, Dec 29 2015