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 A273867 #7 Jun 02 2016 04:42:37 %S A273867 2,5,6,8,9,12 %N A273867 Degrees of fundamental invariants of Weyl group W(E_6). %H A273867 H. S. M. Coxeter and W. O. J. Moser, <a href="http://doi.org/10.1007/978-3-662-21943-0">Generators and Relations for Discrete Groups</a>, 4th ed., Springer-Verlag, NY, reprinted 1984, p. 141. %Y A273867 Cf. A005795, A005796. %K A273867 nonn,fini,full %O A273867 1,1 %A A273867 _Tom Edgar_, Jun 01 2016