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 A226250 #4 Jun 07 2013 14:56:29 %S A226250 1,4,6,8,11,14,16,19,21,23,26,28,30,33,36,38,40,43,46,48,51,53,55,58, %T A226250 61,63,66,68,70,73,75,77,80,83,85,88,90,92,95,97,99,102,105,107,109, %U A226250 112,115,117,120,122,124,127,129,131,134,137,139,141,144,147,149 %N A226250 Positions of positive numbers in the ordering of the rational numbers at A226247. %C A226250 The rational numbers are ordered as a sequence S'' described at A226247. %H A226250 Clark Kimberling, <a href="/A226250/b226250.txt">Table of n, a(n) for n = 1..200</a> %e A226250 The positions 1,2,3,5,6,8,9,11,12,... are read from this ordering: %e A226250 0/1, 1/1, 2/1, -1/1, 3, -1/2, 4/1, -1/3, 1/2, 5, -1/4, 2/3, 3/2, -2, ... %t A226250 (See A226247.) %Y A226250 Cf. A226247. %K A226250 nonn,easy %O A226250 1,2 %A A226250 _Clark Kimberling_, Jun 01 2013