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 A003804 #18 Jun 14 2024 22:31:08
%S A003804 163849992929280,67034222101339041669120,
%T A003804 72736898347485916060188672000,3376566710423156250000000000000000,
%U A003804 35832085525362833262818017603275320524800,21903309038581548352789123727634573903790080,6274437692242927471137606015213542491815936000
%N A003804 Order of universal Chevalley group A_6(q), q = prime power.
%D A003804 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 A003804 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 A003804 a(n) = A(A000961(n+1),6) where A(q,n) is defined in A003787. - _Sean A. Irvine_, Sep 18 2015
%t A003804 f[m_, n_] := m^(n (n + 1)/2) Product[m^k - 1, {k, 2, n + 1}]; f[#, 6] & /@ Select[Range[2, 10], PrimePowerQ] (* _Michael De Vlieger_, Sep 18 2015 *)
%K A003804 nonn,easy
%O A003804 1,1
%A A003804 _N. J. A. Sloane_
%E A003804 Beginning same as A003811.
%E A003804 a(6)-a(7) from _Sean A. Irvine_, Sep 18 2015