G.f. A(x) satisfies A(x) = 1 + 9*x*A(x)^(1/3).

Terms

a(0) =1a(1) =9a(2) =27a(3) =0a(4) =-81a(5) =243a(6) =0a(7) =-2916a(8) =10935a(9) =0a(10) =-168399a(11) =682344a(12) =0a(13) =-11711385a(14) =49364964a(15) =0a(16) =-900438201a(17) =3887490915a(18) =0a(19) =-73729998576a(20) =323480165085a(21) =0a(24) =0a(27) =0a(30) =0