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 A190557 #4 Mar 30 2012 18:57:28 %S A190557 3,5,10,15,20,22,27,32,34,39,44,46,51,56,61,63,68,73,75,80,85,90,92, %T A190557 97,102,104,109,114,116,119,121,126,131,133,138,143,145,150,155,160, %U A190557 162,167,172,174,179,184,186,189,191,196,201,203,208,213,215,220,225,230,232,237,242,244,249,254,259,261,266,271,273,278,283,285 %N A190557 Positions of 1 in A190555. %C A190557 See A190555. %t A190557 (See A190555.) %Y A190557 Cf. A190555. %K A190557 nonn %O A190557 1,1 %A A190557 _Clark Kimberling_, May 12 2011