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 A118560 #7 Dec 03 2019 07:09:52 %S A118560 2,4,8,14,29,66,143,404 %N A118560 Face-pairing graphs (see reference for precise definition). %H A118560 B. A. Burton, <a href="https://people.smp.uq.edu.au/BenjaminBurton/papers/burton07-enumeration.pdf">Enumeration of non-orientable 3-manifolds using face-pairing graphs and union-find</a>, Discrete and Computational Geometry, 38 (2007), 527-571. %K A118560 nonn,more %O A118560 3,1 %A A118560 _N. J. A. Sloane_, Oct 01 2007