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 A307291 #18 Apr 09 2019 03:22:45 %S A307291 2,7,80,1651,62227 %N A307291 Number of colored (or magnetic) space groups in dimension n, including enantiomorphs. %H A307291 R. L. E. Schwarzenberger, <a href="https://doi.org/10.1112/blms/16.3.209">Colour symmetry</a>, Bulletin of the London Mathematical Society 16.3 (1984): 216-229. %H A307291 B. Souvignier, <a href="https://doi.org/10.1107/S0108767303004161">Enantiomorphism of crystallographic groups in higher dimensions with results in dimensions up to 6</a>, Acta Cryst., A59 (2003), 210-220. %Y A307291 Cf. A307290. %Y A307291 Right border of A293063. %Y A307291 For non-magnetic space groups see A006227. %K A307291 nonn,more %O A307291 0,1 %A A307291 _N. J. A. Sloane_, Apr 08 2019 %E A307291 a(0), a(4) from _Andrey Zabolotskiy_, Apr 09 2019