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

Terms

a(0) =1a(1) =1a(2) =1a(3) =2a(4) =2a(5) =3a(6) =5a(7) =9a(8) =18a(9) =38a(10) =79a(11) =162a(12) =330a(13) =661a(14) =1323a(15) =2661a(16) =5392a(17) =11037a(18) =22802a(19) =47447a(20) =99238a(21) =208283a(22) =438143a(23) =923325a(24) =1949051a(25) =4121495a(26) =8731982a(27) =18536690a(28) =39428284a(29) =84023511