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 A048237 #5 Jan 09 2009 03:00:00 %S A048237 1,1,2,5,8,16,30,54,94,168,287,493,831,1391,2293,3769,6114,9867 %N A048237 Duplicate of A048139. %K A048237 dead %O A048237 1,3