G.f. A(x) satisfies A(x) = 1 + 9*x*A(x)^(2/3).

Terms

a(0) =1a(1) =9a(2) =54a(3) =243a(4) =810a(5) =1701a(6) =0a(7) =-16038a(8) =-56862a(9) =0a(10) =817938a(11) =3241134a(12) =0a(13) =-53872371a(14) =-224386200a(15) =0a(16) =4017339666a(17) =17216031195a(18) =0a(19) =-322568743770a(21) =0a(24) =0a(27) =0