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 A151565 #5 Oct 22 2015 02:28:42 %S A151565 1,1,2,2,2,2,4,4,2,2,4,4,4,4,8,8,2,2,4,4,4,4,8,8,4,4,8,8,8,8,16,16,2,2 %N A151565 Duplicate of A060632. %C A151565 This sequence was mentioned in an article, so the A-number has not been recycled. %H A151565 David Applegate, Omar E. Pol and N. J. A. Sloane, <a href="http://arxiv.org/abs/1004.3036">The Toothpick Sequence and Other Sequences from Cellular Automata</a>, arXiv:1004.3036 [math.CO], 2010. %K A151565 dead %O A151565 1,3