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 A088474 #6 Aug 27 2010 03:00:00 %S A088474 19,29,39,49,59,69,79,89,90,91,92,93,94,95,96,97,98,99,109,209,219 %N A088474 Duplicate of A087097. %K A088474 dead %O A088474 1,1