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 A005763 #10 Sep 08 2022 08:44:34
%S A005763 1,5,7,9,11,13,17
%N A005763 Exponents m_i associated with Weyl group W(E7).
%D A005763 H. S. M. Coxeter and W. O. J. Moser, Generators and Relations for Discrete Groups, 4th ed., Springer-Verlag, NY, reprinted 1984, p. 141.
%o A005763 (Magma) Exponents(RootDatum("E7")); // Sergei Haller (sergei(AT)sergei-haller.de), Dec 21 2006
%K A005763 nonn,fini,full
%O A005763 1,2
%A A005763 _N. J. A. Sloane_