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 A266944 #7 Dec 13 2023 08:37:16
%S A266944 1,6,33,150,636,2508,9501,34674,123369,429396,1469733,4959600,
%T A266944 16545597,54662046,179124837,582893052,1885479918,6067245570,
%U A266944 19435083054,62006825166,197128631562,624716063502,1974151076946,6222482535642,19567579430643,61403207075448
%N A266944 Expansion of Product_{k>=1} 1 / (1 - 3*x^k)^2.
%H A266944 Vaclav Kotesovec, <a href="/A266944/b266944.txt">Table of n, a(n) for n = 0..1000</a>
%F A266944 a(n) ~ c * n * 3^n, where c = Product_{k>=1} 1/(1-1/3^k)^2 = 1/QPochhammer(1/3)^2 = 3.187340158492291107944103748176139... .
%t A266944 nmax = 40; CoefficientList[Series[Product[1/(1-3*x^k)^2, {k, 1, nmax}], {x, 0, nmax}], x]
%Y A266944 Cf. A242587, A266943.
%K A266944 nonn
%O A266944 0,2
%A A266944 _Vaclav Kotesovec_, Jan 06 2016