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 A049466 #5 Mar 31 2017 22:31:09 %S A049466 1,4,5,6,9,7,11,14,13,8,13,17,16,19,23,22,17,9,15,20,19,23,28,27,21, %T A049466 24,33,37,32,31,35,30,21,10,17,23,22,27,33,32,25,29,40,45,39,38,43,37, %U A049466 26,29,43,52,47,51,60,55,41,40,53,57,48,43,47,38,25,11,19,26,25 %N A049466 Replace each fraction p/q in Farey tree A007305/A007306 with 3p+q. %D A049466 J. C. Lagarias, Number Theory and Dynamical Systems, pp. 35-72 of S. A. Burr, ed., The Unreasonable Effectiveness of Number Theory, Proc. Sympos. Appl. Math., 46 (1992). Amer. Math. Soc. %F A049466 Equals 3*A007305+A007306. %K A049466 nonn,easy,tabf %O A049466 0,2 %A A049466 _Gregory V. Richardson_