G.f. satisfies: A(x) = A(A(x)) - x*A(A(A(x))), with A(0)=0.

Terms

a(0) =1a(1) =1a(2) =1a(3) =3a(4) =7a(5) =33a(6) =109a(7) =643a(8) =2623a(9) =17929a(10) =85349a(11) =652395a(12) =3517911a(13) =29484193a(14) =176844781a(15) =1605009651a(16) =10575269935a(17) =103033059513a(18) =738834271605