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 A081886 #4 Jan 24 2006 03:00:00 %S A081886 1,5,26,77,522,669,5772,13827,48610,55991,699612,785633,11359222 %N A081886 Duplicate of A081530. %K A081886 dead %O A081886 1,2