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 A049465 #6 Jan 22 2018 22:37:20 %S A049465 1,3,4,5,7,6,9,11,10,7,11,14,13,15,18,17,13,8,13,17,16,19,23,22,17,19, %T A049465 26,29,25,24,27,23,16,9,15,20,19,23,28,27,21,24,33,37,32,31,35,30,21, %U A049465 23,34,41,37,40,47,43,32,31,41,44,37,33,36,29,19,10,17,23,22 %N A049465 Replace each fraction p/q in Farey tree A007305/A007306 with 2p + q. %D A049465 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 A049465 Equals 2*A007305 + A007306. %K A049465 nonn,easy,tabf %O A049465 0,2 %A A049465 _Gregory V. Richardson_