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 A273254 #17 May 18 2016 19:20:53 %S A273254 1,3,5,61 %N A273254 Dimensions of odd-dimensional spheres with unique smooth structure. %H A273254 Guozhen Wang, Zhouli Xu, <a href="http://arxiv.org/abs/1601.02184">On the uniqueness of the smooth structure of the 61-sphere</a>, arXiv:1601.02184 [math.AT], 2016. %K A273254 nonn,fini,full %O A273254 1,2 %A A273254 _Christian Stump_, May 18 2016