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 A335010 #9 May 19 2020 18:27:01
%S A335010 1,9,3087,156279375,4474145825060625,279739266376566114746420625,
%T A335010 149066302192479440045478394157489352699375,
%U A335010 2665022756273454714861436593121414601862237540654765380859375
%N A335010 a(n) = Product_{k=1..n} (2^k - 1)^k.
%F A335010 a(n) ~ c * 2^(n*(n+1)*(2*n+1)/6), where c = A335011 = Product_{k>=1} (1 - 1/2^k)^k.
%t A335010 Table[Product[(2^k - 1)^k, {k, 1, n}], {n, 1, 10}]
%o A335010 (PARI) a(n) = prod(k=1, n, (2^k-1)^k); \\ _Michel Marcus_, May 19 2020
%Y A335010 Cf. A002884, A005329, A048651, A185995, A203303, A335011.
%K A335010 nonn
%O A335010 1,2
%A A335010 _Vaclav Kotesovec_, May 19 2020