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 A004032 M3289 #21 Jan 31 2022 01:26:44 %S A004032 1,1,4,6,23,32,91 %N A004032 Number of n-dimensional crystal families. %D A004032 H. Brown, R. Bülow, J. Neubüser, H. Wondratschek and H. Zassenhaus, Crystallographic Groups of Four-Dimensional Space. Wiley, NY, 1978, p. 52. %D A004032 N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence). %H A004032 W. Plesken and T. Schulz, <a href="http://projecteuclid.org/euclid.em/1045604675">Counting crystallographic groups in low dimensions</a>, Experimental Mathematics, Volume 9 Issue 3 (2000), 321-478 %H A004032 Wikipedia, <a href="http://en.wikipedia.org/wiki/Space_group">Space_group</a> %Y A004032 Cf. A004027-A004031, A006226, A006227. %K A004032 hard,nonn,nice %O A004032 0,3 %A A004032 _N. J. A. Sloane_ %E A004032 a(5)-a(6) from _Henry Bottomley_, Feb 03 2014