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 A090542 #3 Jan 24 2006 03:00:00 %S A090542 1,3,5,7,8,11,13,14,15 %N A090542 Incorrect version of A060462. %K A090542 dead %O A090542 1,2