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 A300583 #8 Sep 05 2025 14:17:04
%S A300583 1,6,54,378,2754,17982,121014,765450,4894506,30429918,189311094,
%T A300583 1160312850,7113869226,43228473822,262556300286,1587419581410,
%U A300583 9590551158474,57795130268694,348125978482686,2093918636332530,12590534397102930,75647788993941174
%N A300583 Expansion of Product_{k>=1} 1 / (1 - 2*3^k*x^k).
%F A300583 a(n) ~ c * 6^n, where c = A065446 = 1/QPochhammer(1/2) = 3.46274661945506361153...
%t A300583 nmax = 25; CoefficientList[Series[Product[1/(1-2*3^k*x^k), {k, 1, nmax}], {x, 0, nmax}], x]
%Y A300583 Cf. A065446, A242587, A300582.
%K A300583 nonn,changed
%O A300583 0,2
%A A300583 _Vaclav Kotesovec_, Mar 09 2018