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

Terms

a(0) =1a(1) =1a(2) =1a(3) =2a(4) =2a(5) =3a(6) =5a(7) =9a(8) =14a(9) =18a(10) =25a(11) =38a(12) =60a(13) =97a(14) =159a(15) =265a(16) =444a(17) =735a(18) =1187a(19) =1865a(20) =2851a(21) =4271a(22) =6378a(23) =9621a(24) =14724a(25) =22864a(26) =35947a(27) =57044a(28) =91141a(29) =146384