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 A090571 #3 May 11 2007 03:00:00 %S A090571 1,1,1,3,2,6,5,1,3,10,7,9,1,2,6,5,17,18,11,13,15,10,2,1,11,10,7,9,17, %T A090571 30 %N A090571 Duplicate of A088452. %K A090571 dead %O A090571 1,4