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 A031988 #5 May 11 2007 03:00:00 %S A031988 0,1,2,4,5,8,13,14,17,26,40,41,44,53,80,121,122,125,134,161,242 %N A031988 Duplicate of A023745. %K A031988 dead %O A031988 1,3