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 A005734 #5 Dec 11 1999 03:00:00 %S A005734 14,23,28,33,42,49,59,66,77,86,96,103,110 %N A005734 Incomplete version of A001049. %K A005734 dead %O A005734 1,1