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 A083298 #2 Nov 10 2007 03:00:00 %S A083298 1,3,25,75,625,1875,15625,46875,390625,1171875,9765625,29296875 %N A083298 Duplicate of A083222. %K A083298 dead %O A083298 0,2