E.g.f. satisfies: A'(x) = A(x) * A(x^2).

Terms

a(0) =1a(1) =1a(2) =1a(3) =3a(4) =9a(5) =33a(6) =153a(7) =963a(8) =6129a(9) =47457a(10) =393489a(11) =3689379a(12) =36673209a(13) =410924097a(14) =4810169961a(15) =64694478627a(16) =878318278497