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 A023988 #4 Jun 29 2008 03:00:00 %S A023988 1,2,4,4,4,6,8,6,7,8,11,11,11,11,12,10,12,11,15,13,13,18,18,17,16,17, %T A023988 19,17 %N A023988 Duplicate of A023819. %K A023988 dead %O A023988 1,2