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 A031963 #12 Sep 28 2024 20:05:29 %S A031963 1,21,56,42,0,0,48 %N A031963 a(n) = number of elements of order n in simple group L_2(7) of order 168. %D A031963 H. Ferguson and C. Ferguson, Eightfold way: the sculpture, pp. 133-173 in S. Levy, ed., The Eightfold Way, Cambridge, 1999. (Beware errors!) %H A031963 <a href="/index/Gre#groups">Index entries for sequences related to groups</a> %o A031963 (Magma) t1:=[0 : n in [1..7]]; G:=PSL(2,7); for g in G do t1[Order(g)]:=t1[Order(g)]+1; end for; t1; // See A145437 for a much better program! %K A031963 nonn,fini,full %O A031963 1,2 %A A031963 _N. J. A. Sloane_, Apr 06 2009