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 A003929 #18 Jul 11 2025 15:36:50
%S A003929 168,138297600,273457218604953600,1298254740461168363656151040000,
%T A003929 14798669658041409826117343924395087366717440000,
%U A003929 405021050810995193742724745833742085838315883140458032922624000000
%N A003929 Order of simple Chevalley group B_n (7).
%H A003929 <a href="/index/Gre#groups">Index entries for sequences related to groups</a>.
%F A003929 a(n) = b(7,n) where b(q,n) is defined in A003927. - _Sean A. Irvine_, Sep 22 2015
%F A003929 a(n) ~ c * 7^(2*n^2+n)/2, where c = Product_{k>=1} (1 - 1/7^(2*k)) = 0.979175347148... . - _Amiram Eldar_, Jul 11 2025
%t A003929 b[q_, n_] := q^(n^2) * Product[q^(2*k) - 1, {k, 1, n}] / GCD[2, q-1]; Table[b[7, n], {n, 1, 6}] (* _Amiram Eldar_, Jul 11 2025 *)
%Y A003929 Cf. A003927, A003928, A003930.
%K A003929 nonn
%O A003929 1,1
%A A003929 _N. J. A. Sloane_
%E A003929 a(6) from _Sean A. Irvine_, Sep 22 2015