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 A374628 #10 Jul 15 2024 10:23:04
%S A374628 1,3,3,4,9,9,6,9,9,7,12,12,13,27,27,18,27,27,15,18,18,15,27,27,18,27,
%T A374628 27,16,21,21,19,36,36,24,36,36,25,39,39,40,81,81,54,81,81,45,54,54,45,
%U A374628 81,81,54,81,81,42,45,45,33,54,54,36,54,54,33,45,45,42,81,81,54,81,81,45,54,54,45,81,81,54,81,81
%N A374628 Expansion of Product_{k>=0} (1 + x^(3^k))^3.
%F A374628 G.f. A(x) satisfies A(x) = (1 + x)^3 * A(x^3).
%o A374628 (PARI) my(N=90, x='x+O('x^N)); Vec(prod(k=0, logint(N, 3), 1+x^3^k)^3)
%Y A374628 Cf. A039966, A120880.
%K A374628 nonn
%O A374628 0,2
%A A374628 _Seiichi Manyama_, Jul 14 2024