G.f. satisfies: A(x) = exp( Sum_{n>=1} x^n/n * Product_{k>=1} (1 + x^(n*k)*A(x^k)^n) ).

Terms

a(0) =1a(1) =1a(2) =2a(3) =4a(4) =9a(5) =20a(6) =46a(7) =107a(8) =253a(9) =604a(10) =1463a(11) =3573a(12) =8812a(13) =21901a(14) =54837a(15) =138145a(16) =350068a(17) =891529a(18) =2281092a(19) =5860471a(20) =15113614a(21) =39109461a(22) =101521521a(23) =264286160a(24) =689820642a(25) =1804890193a(26) =4733051924a(27) =12437565725a(28) =32746931264a(29) =86375236835