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 A324402 #21 Dec 10 2023 09:04:28
%S A324402 1,3,360,6350400,36212520960000,117563342374788710400000,
%T A324402 337905477880065368190647009280000000,
%U A324402 1234818479230749311108497004714406224855040000000000,7795494015765035913020359514023640290443493305037073940480000000000000
%N A324402 a(n) = Product_{i=1..n, j=1..n} (2*i + j).
%H A324402 Robert Israel, <a href="/A324402/b324402.txt">Table of n, a(n) for n = 0..25</a>
%F A324402 a(n) ~ sqrt(A/Pi) * 3^(9*n*(n+1)/4 + 11/24) * n^(n^2 - 11/24) / (2^(n^2 + 3*n/2 + 17/24) * exp(3*n^2/2 + 1/24)), where A is the Glaisher-Kinkelin constant A074962.
%F A324402 a(n) = 3*n*a(n-1)*Product_{i=1..n-1} (2*i+n)(2*n+i). - _Chai Wah Wu_, Feb 26 2019
%F A324402 a(n) = a(n-1) * (3*n)! * (3*n-2)!!/((2*n)! * n!!). - _Robert Israel_, Feb 27 2019
%p A324402 f:= n -> mul((2*i+n)!/(2*i)!,i=1..n):
%p A324402 map(f, [$0..10]); # _Robert Israel_, Feb 27 2019
%t A324402 Table[Product[2*i+j, {i, 1, n}, {j, 1, n}], {n, 1, 10}]
%Y A324402 Cf. A059486, A079478, A324403, A367956, A367957, A367958.
%K A324402 nonn
%O A324402 0,2
%A A324402 _Vaclav Kotesovec_, Feb 26 2019
%E A324402 a(0)=1 prepended by _Alois P. Heinz_, Jun 24 2023