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 A307321 #6 Apr 02 2019 19:19:21
%S A307321 1,1,6,30,143,660,3000,13448,59696,262788,1148738,4989908,21551733,
%T A307321 92596511,395921737,1685304092,7143861196,30163965903,126895681419,
%U A307321 531986033218,2222961809367,9260148591001,38461580964389,159302487751844,658054630483936,2711429650817356
%N A307321 Expansion of Product_{j>=1} 1/(1 - (-1 + Product_{k>=1} 1/(1 - x^k)^k)^j)^j.
%F A307321 G.f.: g(g(x) - 1), where g(x) = g.f. of A000219 (number of planar partitions).
%t A307321 nmax = 25; CoefficientList[Series[Product[1/(1 - (-1 + Product[1/(1 - x^k)^k, {k, 1, nmax}])^j)^j, {j, 1, nmax}], {x, 0, nmax}], x]
%Y A307321 Cf. A000219, A307127, A307323.
%K A307321 nonn
%O A307321 0,3
%A A307321 _Ilya Gutkovskiy_, Apr 02 2019