Expansion of Sum_{k>=0} x^(3^k) / (1 - 3*x^(3^k)).

Terms

a(0) =1a(1) =3a(2) =10a(3) =27a(4) =81a(5) =246a(6) =729a(7) =2187a(8) =6571a(9) =19683a(10) =59049a(11) =177174a(12) =531441a(13) =1594323a(14) =4783050a(15) =14348907a(16) =43046721a(17) =129140409a(18) =387420489a(19) =1162261467a(20) =3486785130a(21) =10460353203a(22) =31381059609a(23) =94143181014a(24) =282429536481a(25) =847288609443