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 A003801 #17 Jun 14 2024 22:31:08
%S A003801 20160,12130560,987033600,29016000000,4635182361600,34558531338240,
%T A003801 203039372390400,4139330225184000,50858076935877120,
%U A003801 1148120010326016000,2851903720876769280,15136750711925049600
%N A003801 Order of universal Chevalley group A_3 (q) (or D_3 (q)), q = prime power.
%D A003801 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 A003801 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 A003801 a(n) = A(A000961(n+1),3) where A(q,n) is defined in A003787. - _Sean A. Irvine_, Sep 18 2015
%t A003801 f[m_, n_] := m^(n (n + 1)/2) Product[m^k - 1, {k, 2, n + 1}]; f[#, 3] & /@ Select[Range[2, 22], PrimePowerQ] (* _Michael De Vlieger_, Sep 18 2015 *)
%K A003801 nonn,easy
%O A003801 1,1
%A A003801 _N. J. A. Sloane_