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 A083814 #6 Jan 09 2009 03:00:00 %S A083814 1,2,4,6,10,16,18,20,24,25,26,28,36,42,50,52,58,61,62,63,66,68,70,80, %T A083814 81 %N A083814 Duplicate of A073805. %K A083814 dead %O A083814 1,2