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 A189729 #4 Mar 30 2012 18:57:25 %S A189729 2,3,4,5,7,8,10,11,13,14,17,18,19,20,22,23,26,27,28,29,31,32,35,36,37, %T A189729 38,40,41,44,45,47,48,49,50,52,53,55,56,58,59,62,63,64,65,67,68,71,72, %U A189729 74,75,76,77,79,80,82,83,85,86,89,90,91,92,94,95,98,99,101,102,103,104,106,107,109,110,112,113,116,117,118,119,121 %N A189729 Positions of 1 in A189727; complement of A189728. %C A189729 See A189727. %t A189729 (See A189727.) %Y A189729 Cf. A189727, A189728, A189730. %K A189729 nonn %O A189729 1,1 %A A189729 _Clark Kimberling_, Apr 26 2011