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 A238839 #12 Dec 06 2018 16:35:25 %S A238839 0,2,3,4,5,6,6,7,8,9,10,10,12,12,13,14,16,18,18,22,25,30,30,46 %N A238839 List of Coxeter numbers of the 24 even unimodular lattices in dimension 24. %C A238839 These lattices consist of the Leech lattice and the 23 Niemeier lattices. %H A238839 J. H. Conway and N. J. A. Sloane, <a href="https://doi.org/10.1007/978-1-4757-2016-7_16">Sphere Packings, Lattices and Groups</a>, 3rd. ed., 1993. Table 16.1, p. 407. %H A238839 Hans-Volker Niemeier, <a href="https://doi.org/10.1016/0022-314X(73)90068-1">Definite quadratische Formen der Dimension 24 und Diskriminante 1</a>, J. Number Theory 5 (1973), 142--178. MR0316384 (47 #4931). %Y A238839 A239048 is a subsequence. %K A238839 nonn,fini,full %O A238839 1,2 %A A238839 _N. J. A. Sloane_, Mar 18 2014