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 A189724 #4 Mar 30 2012 18:57:25 %S A189724 1,5,8,11,13,17,20,22,26,29,31,35,37,41,44,47,49,53,56,58,62,64,68,71, %T A189724 74,76,80,83,85,89,91,95,98,101,103,107,109,113,116,119,121,125,128, %U A189724 130,134,137,139,143,145,149,152,155,157,161,164,166,170,172,176,179,182,184,188,190,194,197,200,202,206,209,211,215,218,220,224 %N A189724 Positions of 0 in A189723; complement of A189725. %C A189724 See A189723. %t A189724 (See A189723.) %Y A189724 Cf. A189723, A189725, A189726. %K A189724 nonn %O A189724 1,2 %A A189724 _Clark Kimberling_, Apr 26 2011