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 A086490 #5 May 11 2007 03:00:00 %S A086490 2,18,35,66,4,84,344,1692,1785,270,4293,1176,9315,1458,3450,5304,2656 %N A086490 Duplicate of A085876. %K A086490 dead %O A086490 1,1