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 A099639 #5 Nov 10 2007 03:00:00 %S A099639 1,66,6216,617716,61732716,6172882716,617284382716,61728399382716 %N A099639 Duplicate of A003555. %K A099639 dead %O A099639 1,2