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 A083274 #3 May 11 2007 03:00:00 %S A083274 1,28,30,52,231,277,523,2278,22749,48854,371305,1447522,1726931, %T A083274 1947729 %N A083274 Duplicate of A067913. %K A083274 dead %O A083274 1,2