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 A003799 #15 Jun 14 2024 22:31:08
%S A003799 1,360,42456960,50759843097600,78660280796419613491200,
%T A003799 1234219157861100568481165377536000,
%U A003799 6274437692242927471137606015213542491815936000,161481381212849029341257163594808056515516032931132866560000
%N A003799 Order of simple Chevalley group A_n (9).
%D A003799 J. H. Conway, R. T. Curtis, S. P. Norton, R. A. Parker and R. A. Wilson, ATLAS of Finite Groups. Oxford Univ. Press, 1985 [for best online version see https://oeis.org/wiki/Welcome#Links_to_Other_Sites], p. xvi.
%D A003799 H. S. M. Coxeter and W. O. J. Moser, Generators and Relations for Discrete Groups, 4th ed., Springer-Verlag, NY, reprinted 1984, p. 131.
%F A003799 a(n) = a(9,n) where a(q,n) is defined in A003793. - _Sean A. Irvine_, Sep 18 2015
%t A003799 f[m_, n_] := Block[{g, x, y}, g[x_, y_] := x^(y (y + 1)/2) Product[x^k - 1, {k, 2, y + 1}]; g[m, n]/GCD[n + 1, m - 1]]; f[9, #] & /@ Range[0, 7] (* _Michael De Vlieger_, Sep 18 2015 *)
%K A003799 nonn,easy
%O A003799 0,2
%A A003799 _N. J. A. Sloane_
%E A003799 a(7) from _Sean A. Irvine_, Sep 18 2015