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

Terms

a(0) =1a(1) =3a(2) =6a(3) =13a(4) =24a(5) =39a(6) =64a(7) =99a(8) =144a(9) =212a(10) =303a(11) =417a(12) =578a(13) =786a(14) =1041a(15) =1382a(16) =1809a(17) =2322a(18) =2985a(19) =3798a(20) =4761a(21) =5973a(22) =7434a(23) =9144a(24) =11247a(25) =13743a(26) =16632a(27) =20126a(28) =24225a(29) =28929