G.f. A(x) satisfies: A(x) = (1 + x) * A(x^2)*A(x^3)*A(x^5)* ... *A(x^prime(k))* ...

Terms

a(0) =1a(1) =1a(2) =1a(3) =2a(4) =2a(5) =3a(6) =5a(7) =6a(8) =7a(9) =10a(10) =13a(11) =16a(12) =22a(13) =27a(14) =33a(15) =44a(16) =53a(17) =65a(18) =84a(19) =101a(20) =124a(21) =156a(22) =187a(23) =226a(24) =280a(25) =336a(26) =403a(27) =492a(28) =587a(29) =700