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 A367942 #6 Dec 07 2023 02:18:52
%S A367942 1,4,5824,45861064704,9751658280030585225216,
%T A367942 176005320076923781520069562958715289600,
%U A367942 656508955366282248103393001602851493819854909361664242483200
%N A367942 a(n) = Product_{i=1..n, j=1..n} (i^2 + 3*j^2).
%F A367942 a(n) ~ c * n^(2*n^2 - 1/2) * 4^(n*(n+1)) * 3^(-n/2) * exp(5*Pi*n*(n+1)/(6*sqrt(3)) - 3*n^2), where c = 0.4612030005343304845802441101292774353695846313857765074861837886133930626...
%t A367942 Table[Product[i^2+3*j^2, {i, 1, n}, {j, 1, n}], {n, 0, 8}]
%Y A367942 Cf. A324403, A367941, A367943, A367944.
%Y A367942 Cf. A367542, A367543.
%K A367942 nonn
%O A367942 0,2
%A A367942 _Vaclav Kotesovec_, Dec 05 2023