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 A211882 #4 Jun 21 2012 03:25:05 %S A211882 2,2,4,4,4,16,4,8,8,16,4,256,4,16,16,16,4,512,4,256,16,16,4,4096,8,16, %T A211882 16,256,4,65536,4,32,16,16,16,262144,4,16,16,4096,4,65536,4,256,64,16, %U A211882 4,65536,8,512,16,256,4,65536,16,4096,16,16,4,4294967296 %N A211882 Number of integral circulant graphs with perfect state transfer on 4*n vertices. %H A211882 Fomin, Sergey; Zelevinsky, Andrei; <a href="http://arxiv.org/abs/math/0104241">The Laurent phenomenon</a>, arXiv:math/0104241v1 [math.CO] (2001), Advances in Applied Mathematics 28 (2002), 119-144. %e A211882 For n=1 there are a(1)=2 graphs with perfect state transfer: C_4 and the disjoint union of two copies of K_2. %K A211882 nonn %O A211882 1,1 %A A211882 _Matthew C. Russell_, Apr 25 2012