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

Terms

a(0) =1a(1) =1a(2) =1a(3) =2a(4) =4a(5) =9a(6) =20a(7) =47a(8) =112a(9) =274a(10) =678a(11) =1702a(12) =4314a(13) =11039a(14) =28460a(15) =73875a(16) =192884a(17) =506251a(18) =1334899a(19) =3534591a(20) =9394196a(21) =25052866a(22) =67019457a(23) =179793858a(24) =483591479a(25) =1303836901a(26) =3523141231a(27) =9539570474a(28) =25879559378a(29) =70332798052