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 A071420 #3 May 11 2007 03:00:00 %S A071420 7,8,5,5,3,4,4,6,9,7,8,8,7,8,5,5,3,4,4,6,9,7,8,8,7,8,5,5,3,4,4,6,9 %N A071420 Duplicate of A031139. %K A071420 dead %O A071420 1,1