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 A227405 #11 Jan 13 2014 09:32:39 %S A227405 4,6,8,10,12,12,14,16,2,2,6,2 %N A227405 Order of the symmetry group of the densest possible packing of N circles in a larger circle. (If there are different patterns with the same density pick the largest value of the symmetry group order.) %C A227405 a(14) is unknown but conjectured to be 2. %C A227405 The conjectured sequence is 4, 6, 8, 10, 12, 12, 14, 16, 2, 2, 6, 2, 2, 10, 2, 2, 12, 12, 2... %H A227405 Wikipedia, <a href="http://en.wikipedia.org/wiki/Circle_packing_in_a_circle">Circle packing in a circle</a> %K A227405 sign,hard,more %O A227405 2,1 %A A227405 _Keenan Pepper_, Sep 21 2013