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 A003851 #18 Jun 24 2025 11:03:19
%S A003851 23499295948800,1289512799941305139200,1154606796534757164318720000,
%T A003851 6807663884896875000000000000000,
%U A003851 52386144472825139642572263782154240000,42863636354909175368011800612065142374400,2154683673871373733440812330742751559680000
%N A003851 Order of simple Chevalley group D_5(q), q = prime power.
%D A003851 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 A003851 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 A003851 <a href="/index/Gre#groups">Index entries for sequences related to groups</a>.
%F A003851 a(n) = d(A000961(n+1),5) where d(q,n) is defined in A003837. - _Sean A. Irvine_, Sep 17 2015
%t A003851 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[q, 5], {q, Select[Range[20], PrimePowerQ]}] (* _Amiram Eldar_, Jun 24 2025 *)
%Y A003851 Cf. A000961, A003808, A003837, A003848, A003850, A003852, A003853, A003854.
%K A003851 nonn,easy
%O A003851 1,1
%A A003851 _N. J. A. Sloane_
%E A003851 More terms from _Sean A. Irvine_, Sep 17 2015