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 A061016 #4 May 11 2007 03:00:00 %S A061016 10,19,20,29,30,39,40,42,49,50,59,60,69,70,79,80,89,90,99,100,102,108 %N A061016 Duplicate of A038366. %K A061016 dead %O A061016 1,1