G.f. A(x) satisfies: A(x)^3 = (1-x) * (A(x) + x)^2.

Terms

a(0) =1a(1) =1a(2) =-3a(3) =7a(4) =-25a(5) =99a(6) =-424a(7) =1906a(8) =-8874a(9) =42412a(10) =-206878a(11) =1025718a(12) =-5154020a(13) =26188190a(14) =-134327493a(15) =694610923a(16) =-3617170909a(17) =18952557141a(18) =-99844769274a(19) =528543587562