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 A080771 #3 Feb 27 2009 03:00:00 %S A080771 0,2,3,2,4,2,3,5,2,6,4,2,3,7,2,5,8,2,3,2,9,2,4,6,2,2,10,3,2,2,2,11,7,3 %N A080771 Duplicate of A025477. %K A080771 dead %O A080771 1,2