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 A190813 #4 Mar 30 2012 18:57:29 %S A190813 1,5,9,13,17,18,22,26,30,34,39,43,47,51,56,60,64,68,73,77,81,85,89,90, %T A190813 94,98,102,106,111,115,119,123,128,132,136,140,145,149,153,157,161, %U A190813 162,166,170,174,178,183,187,191,195,200,204,208,212,217,221,225,229,233,234,238,242,246,250,255,259,263,267,272,276,280,284,289 %N A190813 Positions of 0 in A189480. %C A190813 A sequence in a 4-way partition of the natural numbers. See A189480. %t A190813 (See A189480.) %Y A190813 Cf. A189480. %K A190813 nonn %O A190813 1,2 %A A190813 _Clark Kimberling_, May 23 2011