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 A321354 #9 Nov 07 2018 21:45:07
%S A321354 1,3,3,10,27,27,45,108,108,147,333,333,480,1107,1107,1467,3294,3294,
%T A321354 3801,8109,8109,9300,19791,19791,22644,48141,48141,50806,104277,
%U A321354 104277,107011,216756,216756,224937,458055,458055,454437,905256,905256,870777,1707075,1707075
%N A321354 Expansion of Product_{k>=0} (1 + x^(3^k))^(3^(k+1)).
%C A321354 Also the coefficient of x^(3*n) in the expansion of Product_{k>=0} (1 + x^(3^k))^(3^k).
%e A321354 Product_{k>=0} (1 + x^(3^k))^(3^k) = 1 + x + 3*x^3 + 3*x^4 + 3*x^6 + 3*x^7 + 10*x^9 + 10*x^10 + 27*x^12 + 27*x^13 + 27*x^15 + 27*x^16 + 45*x^18 + 45*x^19 + ... .
%Y A321354 Cf. A073708, A321344, A321355, A321357.
%K A321354 nonn
%O A321354 0,2
%A A321354 _Seiichi Manyama_, Nov 07 2018