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 A346564 #5 Jul 23 2021 21:02:51
%S A346564 1,2,20,26426,61390791862967,
%T A346564 769671787836269530451291677988751813890576
%N A346564 Number of compositions (ordered partitions) of 3^n into powers of 3.
%C A346564 The next term is too large to include.
%H A346564 <a href="/index/Com#comp">Index entries for sequences related to compositions</a>
%F A346564 a(n) = [x^(3^n)] 1 / (1 - Sum_{k>=0} x^(3^k)).
%F A346564 a(n) = A078932(A000244(n)).
%t A346564 Table[SeriesCoefficient[1/(1 - Sum[x^(3^k), {k, 0, n}]), {x, 0, 3^n}], {n, 0, 5}]
%Y A346564 Cf. A000244, A078125, A078932, A248377, A337990, A346565.
%K A346564 nonn
%O A346564 0,2
%A A346564 _Ilya Gutkovskiy_, Jul 23 2021