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 A011799 #23 Jul 14 2019 13:41:32 %S A011799 3,7,18,36,61,93,132,178,231,291,358,432 %N A011799 Duplicate of A006124. %Y A011799 Cf. A006124. %K A011799 dead %O A011799 0,1