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 A308652 #24 Aug 23 2019 17:12:23
%S A308652 1,1,5,252,380562,26605273464,146392210728465000,
%T A308652 84641321148614770425516288,7097143900835489590932722296959504144,
%U A308652 109983275218947201453245400551817117367706036248320,397899007017966277799025689101644536884667639093655295898437500000
%N A308652 a(n) = Product_{k=1..n} sigma(n,k).
%F A308652 a(n) ~ (n!)^n.
%F A308652 a(n) ~ 2^(n/2) * Pi^(n/2) * n^(n*(2*n+1)/2) / exp(n^2-1/12).
%p A308652 with(NumberTheory): seq(product(sigma[n](k), k = 1..n), n = 0..10);
%t A308652 Table[Product[DivisorSigma[n, k], {k, 1, n}], {n, 1, 10}]
%o A308652 (PARI) a(n) = prod(k=1, n, sigma(k, n));
%o A308652 for(n=1, 10, print1(a(n), ", "))
%Y A308652 Cf. A236329, A319194.
%K A308652 nonn
%O A308652 0,3
%A A308652 _Vaclav Kotesovec_, Aug 20 2019
%E A308652 a(0)=1 prepended by _Alois P. Heinz_, Aug 23 2019