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 A003843 #18 Jun 24 2025 08:17:48
%S A003843 174182400,19808719257600,67010895544320000,35646156000000000000,
%T A003843 450219964711195607040000,19031213036231093492121600,
%U A003843 516728027484579221176320000,142998501741091915820267520000
%N A003843 Order of universal Chevalley group D_4(q), q = prime power.
%D A003843 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 A003843 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 A003843 <a href="/index/Gre#groups">Index entries for sequences related to groups</a>.
%F A003843 a(n) = D(A000961(n+1),4) where D(q,n) is defined in A003830. - _Sean A. Irvine_, Sep 17 2015
%t A003843 d[q_, n_] := q^(n*(n-1)) * (q^n-1) * Product[q^(2*k) - 1, {k, 1, n-1}]; Table[d[q, 4], {q, Select[Range[12], PrimePowerQ]}] (* _Amiram Eldar_, Jun 24 2025 *)
%Y A003843 Cf. A000961, A003801, A003830, A003841, A003844, A003845, A003846, A003847.
%K A003843 nonn,easy
%O A003843 1,1
%A A003843 _N. J. A. Sloane_