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 A049468 #7 Jun 18 2022 15:50:17 %S A049468 2,3,5,7,8,9,12,13,11,11,16,19,17,18,21,19,14,13,20,25,23,26,31,29,22, %T A049468 23,31,34,29,27,30,25,17,15,24,31,29,34,41,39,30,33,45,50,43,41,46,39, %U A049468 27,28,41,49,44,47,55,50,37,35,46,49,41,36,39,31,20,17,28,37 %N A049468 Replace each fraction p/q in Farey tree A007305/A007306 with p+2q. %D A049468 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 A049468 Equals A007305 + 2*A007306. %Y A049468 Cf. A007305, A007306. %K A049468 nonn,easy,tabf %O A049468 0,1 %A A049468 _Gregory V. Richardson_