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 A068709 #4 May 11 2007 03:00:00 %S A068709 1,3,6,10,21,45,78,120,190,210,231,435,465,9180,9870,12403,24310,24531 %N A068709 Duplicate of A068804. %K A068709 dead %O A068709 1,2