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 A048137 #1 Dec 11 1999 03:00:00 %S A048137 1,1,2,14,546,16944 %N A048137 Erroneous version of A005806. %K A048137 dead %O A048137 1,3