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 A003838 #14 Jun 24 2025 11:03:32
%S A003838 1,3600,7254000000,8911539000000000000,
%T A003838 6807663884896875000000000000000,
%U A003838 3246978048053003424316406250000000000000000000,967724409898859060146424426078796386718750000000000000000000000
%N A003838 Order of (usually) simple Chevalley group D_n (5).
%D A003838 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 A003838 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 A003838 <a href="/index/Gre#groups">Index entries for sequences related to groups</a>.
%F A003838 a(n) = d(5,n) where d(q,n) is defined in A003837. - _Sean A. Irvine_, Sep 17 2015
%t A003838 d[q_, n_] := q^(n*(n-1)) * (q^n-1) * Product[q^(2*k) - 1, {k, 1, n-1}] / GCD[4, q^n-1]; Table[d[5, n], {n, 1, 8}] (* _Amiram Eldar_, Jun 24 2025 *)
%Y A003838 Cf. A003837, A003839, A003840.
%K A003838 nonn,easy
%O A003838 1,2
%A A003838 _N. J. A. Sloane_
%E A003838 a(7) from _Sean A. Irvine_, Sep 17 2015