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 A325053 #9 Mar 27 2019 08:21:22
%S A325053 3,81,103680,447180963840,7014935716261432173527040,
%T A325053 1921470539412808834455592518302690305036517376000,
%U A325053 81601182941928855942156180258180656419177691149082352022004942698629910149621350400000
%N A325053 a(n) = Product_{i=0..n, j=0..n} (i! + j! + 1).
%F A325053 a(n) = A306729(n) * Product_{i=0..n, j=0..n} (1 + 1/(i! + j!)).
%F A325053 a(n) ~ c * A324569 * 2^(n^2/2 + 2*n) * Pi^(n^2/2 + n) * n^(2*n^3/3 + 2*n^2 + 11*n/6 + 5/2) / exp(8*n^3/9 + 2*n^2 + n), where c = Product_{i>=0, j>=0} (1 + 1/(i! + j!)) = 71.32069635593350979104242285703294604508330622582076432053456223608...
%t A325053 Table[Product[i! + j! + 1, {i, 0, n}, {j, 0, n}], {n, 0, 7}]
%Y A325053 Cf. A107254, A306729, A325052.
%K A325053 nonn
%O A325053 0,1
%A A325053 _Vaclav Kotesovec_, Mar 26 2019