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 A003811 #19 Jun 14 2024 22:31:08
%S A003811 163849992929280,67034222101339041669120,
%T A003811 72736898347485916060188672000,3376566710423156250000000000000000,
%U A003811 35832085525362833262818017603275320524800,3129044148368792621827017675376367700541440
%N A003811 Order of simple Chevalley group A_6(q), q = prime power.
%D A003811 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 A003811 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 A003811 a(n) = a(A000961(n+1),6) where a(q,n) is defined in A003793. - _Sean A. Irvine_, Sep 18 2015
%t A003811 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[#, 6] & /@ Select[Range[2, 8], PrimePowerQ] (* _Michael De Vlieger_, Sep 18 2015 *)
%K A003811 nonn,easy
%O A003811 1,1
%A A003811 _N. J. A. Sloane_
%E A003811 Beginning same as A003804.
%E A003811 a(6) from _Sean A. Irvine_, Sep 18 2015