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 A081877 #4 May 11 2007 03:00:00 %S A081877 1,2,3,1,4,1,2,1,1,1,5,1,2,1,1,1,3,1,2,1,1,1,2,1,1,1,1,1,2,1,6,1,1,1,1 %N A081877 Duplicate of A049076. %K A081877 dead %O A081877 1,2