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 A367668 #10 Nov 26 2023 12:44:29
%S A367668 1,2704,4343072672016,104066856161782811235776987136,
%T A367668 368057974579278182597141600363036562863943425064960000,
%U A367668 1139317987311004502889916180807286481186277543437822119282797720728081762451885916160000
%N A367668 a(n) = Product_{i=1..n, j=1..n} (i^4 - i^2*j^2 + j^4).
%F A367668 a(n) ~ c * (2 + sqrt(3))^(sqrt(3)*n*(n+1)) * n^(4*n^2 - 1) / exp(6*n^2 - Pi*n*(n+1)/2), where c = 0.219927317102868518491484945565471919409874745762951216457178735860943437...
%t A367668 Table[Product[Product[i^4 - i^2*j^2 + j^4, {i, 1, n}], {j, 1, n}], {n, 1, 10}]
%o A367668 (Python)
%o A367668 from math import prod, factorial
%o A367668 def A367668(n): return (prod((k:=j**2)**2+(m:=i**2)*(m-k) for i in range(1,n) for j in range(i+1,n+1))*factorial(n)**2)**2 # _Chai Wah Wu_, Nov 26 2023
%Y A367668 Cf. A203675, A324437, A367550.
%K A367668 nonn
%O A367668 1,2
%A A367668 _Vaclav Kotesovec_, Nov 26 2023