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 A067020 #7 May 11 2007 03:00:00 %S A067020 7,9,13,14,18,19,21,26,27,28,35,36,37,38,39,42,45,52,54,56,57,63,65,70 %N A067020 Duplicate of A051913. %K A067020 dead %O A067020 1,1