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 A081255 #2 May 11 2007 03:00:00 %S A081255 3,1,4,7,29,199,5778,1149851,6643838879,7639424778862807 %N A081255 Duplicate of A005371. %K A081255 dead %O A081255 0,1