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 A099734 #2 Feb 24 2006 03:00:00 %S A099734 251,1741,3301,5101,5381,6311,6361,12641,13451,14741,15791,15901 %N A099734 Duplicate of A033451. %K A099734 dead %O A099734 1,1