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 A098677 #3 May 11 2007 03:00:00 %S A098677 281,521,1031,1951,2281,2311,2591,3671,5471,5711,6791,7481,8111,8681 %N A098677 Duplicate of A056215. %K A098677 dead %O A098677 1,1