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 A003789 #27 Jul 08 2025 07:50:48
%S A003789 1,120,372000,29016000000,56653740000000000,2766118855500000000000000,
%T A003789 3376566710423156250000000000000000,
%U A003789 103044374585338670859375000000000000000000000
%N A003789 Order of universal Chevalley group A_n (5).
%D A003789 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 A003789 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 A003789 <a href="/index/Gre#groups">Index entries for sequences related to groups</a>.
%F A003789 Numbers so far appear to equal A053292(n)/4. - _Ralf Stephan_, Mar 30 2004
%F A003789 a(n) = A(5,n) where A(q,n) is defined in A003787. - _Sean A. Irvine_, Sep 18 2015
%F A003789 a(n) ~ c * 5^(n*(n+2)), where c = (5/4) * A100222 = 0.950415994839... . - _Amiram Eldar_, Jul 07 2025
%t A003789 f[m_, n_] := m^(n (n + 1)/2) Product[m^k - 1, {k, 2, n + 1}]; f[5, #] & /@ Range[0, 7] (* _Michael De Vlieger_, Sep 18 2015 *)
%o A003789 (Magma) [&*[(5^n-5^k): k in [0..n-1]]/4: n in [1..8]]; // _Vincenzo Librandi_, Sep 19 2015
%Y A003789 Cf. A003787, A003788, A003790, A003791, A003792, A053292, A100222.
%K A003789 nonn,easy
%O A003789 0,2
%A A003789 _N. J. A. Sloane_