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 A028678 #14 Jul 14 2025 00:25:16
%S A028678 1,240,15667200,262787825664000,1128647894950886768640000,
%T A028678 1240960300690310266540982796288000000,
%U A028678 349299250915794737048265419604885133559070720000000,25169663526478361283103094344080671195753840937477514828185600000000
%N A028678 Pseudo Galois numbers for d=16; order of group AGL(n,2^4).
%H A028678 Vincenzo Librandi, <a href="/A028678/b028678.txt">Table of n, a(n) for n = 0..28</a>
%F A028678 a(n) = 16^n * Product_{k=0..n-1} (16^n - 16^k).
%F A028678 a(n) ~ c * 16^(n^2+n), where c = Product_{k>=1} (1 - 1/16^k) = 0.933594707399... . - _Amiram Eldar_, Jul 13 2025
%t A028678 FoldList[ #1*16^#2 (16^#2-1)&, 1, Range[ 20 ] ]
%t A028678 a[n_] := 16^n * Product[16^n - 16^k, {k, 0, n-1}]; Array[a, 8, 0] (* _Amiram Eldar_, Jul 13 2025 *)
%o A028678 (PARI) a(n) = 16^n * prod(k = 0, n-1, 16^n - 16^k); \\ _Amiram Eldar_, Jul 13 2025
%Y A028678 Cf. A028668, A028670, A028671, A028672, A028674, A028676, A028677, A028680, A028682, A028683, A028684, A028686.
%K A028678 nonn
%O A028678 0,2
%A A028678 _Olivier Gérard_