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 A307323 #5 Apr 02 2019 19:19:33
%S A307323 1,1,4,18,74,303,1206,4741,18466,71463,274879,1051509,4001727,
%T A307323 15157935,57170668,214787989,804049797,2999846236,11156943967,
%U A307323 41370989836,152973793900,564117250793,2074959664189,7613615954760,27871659379578,101805487967357,371072295698710
%N A307323 Expansion of Product_{j>=1} (1 + (-1 + Product_{k>=1} (1 + x^k)^k)^j)^j.
%F A307323 G.f.: g(g(x) - 1), where g(x) = g.f. of A026007.
%t A307323 nmax = 26; CoefficientList[Series[Product[(1 + (-1 + Product[(1 + x^k)^k, {k, 1, nmax}])^j)^j, {j, 1, nmax}], {x, 0, nmax}], x]
%Y A307323 Cf. A026007, A307128, A307321.
%K A307323 nonn
%O A307323 0,3
%A A307323 _Ilya Gutkovskiy_, Apr 02 2019