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 A003847 #19 Jun 14 2024 22:31:08
%S A003847 911666827031785075278550369566720000,
%T A003847 1574947942338058195342953134725345263180893951172280320000,
%U A003847 1649493899207759406688161287839326786813727965837588934265143296000000000
%N A003847 Order of universal Chevalley group D_8(q), q = prime power.
%D A003847 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 A003847 H. S. M. Coxeter and W. O. J. Moser, Generators and Relations for Discrete Groups, 4th ed., Springer-Verlag, NY, reprinted 1984, p. 131.
%H A003847 Sean A. Irvine, <a href="/A003847/b003847.txt">Table of n, a(n) for n = 1..10</a>
%F A003847 a(n) = D(A000961(n+1),8) where D(q,n) is defined in A003830. _Sean A. Irvine_, Sep 17 2015
%t A003847 f[m_, n_] := m^(n (n - 1)) (m^n - 1) Product[m^(2 k) - 1, {k, n - 1}]; f[#, 8] & /@ Select[Range[2, 4], PrimePowerQ] (* _Michael De Vlieger_, Sep 17 2015 *)
%K A003847 nonn,easy
%O A003847 1,1
%A A003847 _N. J. A. Sloane_
%E A003847 a(3) added by _Sean A. Irvine_, Sep 17 2015