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 A368622 #8 Jan 06 2024 14:24:57
%S A368622 1,3,5832,172907569296,419358815743567702818816,
%T A368622 267800543010963952830647446563000000000000,
%U A368622 110831581527076064529150462985910455129725821244148698662830080000
%N A368622 a(n) = Product_{j=1..n, k=1..n} (j^2 + k^2 + n^2).
%C A368622 The limit has a closed form. In Mathematica: Exp[Integrate[Log[x^2 + y^2 + 1], {x,0,1}, {y,0,1}]]. The output is extremely large.
%F A368622 Limit_{n->oo} a(n)^(1/(n^2)) / n^2 = exp(Integral_{x=0..1, y=0..1} log(x^2 + y^2 + 1) dy dx) = 1.6143980185761253961882683158432481977126507900460725431661...
%t A368622 Table[Product[j^2 + k^2 + n^2, {j, 1, n}, {k, 1, n}], {n, 0, 10}]
%Y A368622 Cf. A272244, A324403, A324425, A368720, A368721.
%K A368622 nonn
%O A368622 0,2
%A A368622 _Vaclav Kotesovec_, Jan 01 2024