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 A003925 #21 Jul 10 2025 04:16:18 %S A003925 504,1056706560,9077005607176765440,319368723699461283992462111539200, %T A003925 46025883638628966977843321053405598530493271244800, %U A003925 27168886279544618607869530961362524544707830196725394137207827070976000 %N A003925 Order of universal Chevalley group B_n (8). %D A003925 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 A003925 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 A003925 <a href="/index/Gre#groups">Index entries for sequences related to groups</a>. %F A003925 a(n) = B(8,n) where B(q,n) is defined in A003920. - _Sean A. Irvine_, Sep 22 2015 %F A003925 a(n) ~ c * 8^(2*n^2+n), where c = Product_{k>=1} (1-1/64^k) = 0.984130860306... . - _Amiram Eldar_, Jul 09 2025 %t A003925 B[q_, n_] := q^(n^2) * Product[q^(2*k) - 1, {k, 1, n}]; Table[B[8, n], {n, 1, 6}] (* _Amiram Eldar_, Jun 23 2025 *) %Y A003925 Cf. A003920, A003921, A003922, A003924, A003926. %K A003925 nonn,easy %O A003925 1,1 %A A003925 _N. J. A. Sloane_ %E A003925 a(6) from _Sean A. Irvine_, Sep 22 2015