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 A307566 #5 Apr 16 2019 15:27:38
%S A307566 1,1,4,18,72,289,1119,4301,16408,62313,234914,879822,3274623,12125348,
%T A307566 44707778,164258803,601535222,2195926654,7990792367,28985219498,
%U A307566 104811279467,377875493610,1358584361039,4872111113570,17431266435024,62229179950735,221699783190996,788274748711694
%N A307566 Expansion of Product_{j>=1} (1 + j*(-1 + Product_{k>=1} (1 + k*x^k))^j).
%F A307566 G.f.: g(g(x) - 1), where g(x) = g.f. of A022629.
%t A307566 nmax = 27; CoefficientList[Series[Product[(1 + j (-1 + Product[(1 + k x^k), {k, 1, nmax}])^j), {j, 1, nmax}], {x, 0, nmax}], x]
%Y A307566 Cf. A022629, A307128, A307323, A307494.
%K A307566 nonn
%O A307566 0,3
%A A307566 _Ilya Gutkovskiy_, Apr 15 2019