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 A307288 #11 Apr 09 2019 03:21:35 %S A307288 1,2,13,73,780,6079 %N A307288 Number of arithmetic classes of space groups in dimension n, including enantiomorphs. %H A307288 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 A307288 Wikipedia, <a href="https://en.wikipedia.org/wiki/Space_group">Space group</a> %Y A307288 For the case when enantiomorphs are not included see A004027. %K A307288 nonn,more %O A307288 0,2 %A A307288 _N. J. A. Sloane_, Apr 08 2019