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 A087317 #3 May 11 2007 03:00:00 %S A087317 2,3,2,3,2,5,14,3,2,3,2,5,21,3,2,3,2,5,8,3,2,7,10,5,10,3,2,3,2,7,15,5, %T A087317 6 %N A087317 Duplicate of A086489. %K A087317 dead %O A087317 1,1