G.f. satisfies: A(x) = (1+x) * A(x^2)*A(x^3)*A(x^4)*...*A(x^n)*...

Terms

a(0) =1a(1) =1a(2) =1a(3) =2a(4) =3a(5) =4a(6) =7a(7) =9a(8) =13a(9) =19a(10) =26a(11) =34a(12) =52a(13) =67a(14) =89a(15) =123a(16) =166a(17) =214a(18) =295a(19) =380a(20) =501a(21) =660a(22) =858a(23) =1098a(24) =1461a(25) =1858a(26) =2384a(27) =3072a(28) =3940a(29) =4975