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 A306760 #15 Jun 24 2023 15:58:15
%S A306760 1,2,90,705600,4105057320000,52487876090562232320000,
%T A306760 3487017405172854771910634342400000000,
%U A306760 2448893405298238642974553493547144534294528000000000000,33257039167768610289435138215602132823918399655132218973388800000000000000000
%N A306760 a(n) = Product_{i=1..n, j=1..n} (i*j + 1).
%F A306760 a(n) ~ c * n^(n*(2*n+1) + 2*gamma) * (2*Pi)^n * exp(1/6 + log(n)^2 - 2*n^2), where c = 1/A306765 and gamma is the Euler-Mascheroni constant A001620.
%p A306760 a:= n-> mul(mul(i*j+1, i=1..n), j=1..n):
%p A306760 seq(a(n), n=0..9); # _Alois P. Heinz_, Jun 24 2023
%t A306760 Table[Product[i*j + 1, {i, 1, n}, {j, 1, n}], {n, 1, 10}]
%t A306760 Table[n!^(2*n) * Product[Binomial[n + 1/j, n], {j, 1, n}], {n, 1, 10}]
%Y A306760 Cf. A079478, A101686, A185141, A324444, A306765, A324589, A306907.
%K A306760 nonn
%O A306760 0,2
%A A306760 _Vaclav Kotesovec_, Mar 08 2019
%E A306760 a(0)=1 prepended by _Alois P. Heinz_, Jun 24 2023