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 A049467 #5 Mar 31 2017 22:30:50 %S A049467 1,5,6,7,11,8,13,17,16,9,15,20,19,23,28,27,21,10,17,23,22,27,33,32,25, %T A049467 29,40,45,39,38,43,37,26,11,19,26,25,31,38,37,29,34,47,53,46,45,51,44, %U A049467 31,35,52,63,57,62,73,67,50,49,65,70,59,53,58,47,31,12,21,29 %N A049467 Replace each fraction p/q in Farey tree A007305/A007306 with 4p+q. %D A049467 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 A049467 Equals 4*A007305+A007306. %K A049467 nonn,easy,tabf %O A049467 0,2 %A A049467 _Gregory V. Richardson_