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 A018843 #22 Nov 02 2021 07:05:30 %S A018843 1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,2,0,1,3,38,10092 %N A018843 Number of n-dimensional unimodular lattices without roots. %C A018843 The paper by Oliver King (king(AT)math.berkeley.edu) shows that a(29) >= 8900 and a(30) >= 82000000. %H A018843 R. Bacher and B. B. Venkov, <a href="https://www-fourier.univ-grenoble-alpes.fr/?q=fr/content/reseaux-entiers-unimodulaires-sans-racine-en-dimension-27-et-28">Réseaux entiers unimodulaires sans racine en dimension 27 et 28</a>, in Réseaux euclidiens, designs sphériques et formes modulaires, pp. 212-267, Enseignement Math., Geneva, 2001. %H A018843 Gaëtan Chenevier, <a href="http://gaetan.chenevier.perso.math.cnrs.fr/pub.html">Publications</a> %H A018843 J. H. Conway and N. J. A. Sloane, <a href="https://www.researchgate.net/publication/46957856_Sphere_Packings_Lattices_and_Groups">Sphere Packings, Lattices and Groups</a>, Springer-Verlag, Preface to 3rd ed. %H A018843 O. King, <a href="http://arXiv.org/abs/math/0012231">A mass formula for unimodular lattices with no roots</a>, arXiv:math/0012231 [math.NT], 2000-2001. %Y A018843 Cf. A005134. %K A018843 nonn,hard %O A018843 0,25 %A A018843 _N. J. A. Sloane_, _Roland Bacher_ %E A018843 a(29) added from Gaëtan Chenevier's page by _Andrey Zabolotskiy_, Nov 02 2021