G.f. A(x) satisfies: A( x - A(x) ) = x^2.

Terms

a(0) =1a(1) =2a(2) =9a(3) =56a(4) =420a(5) =3572a(6) =33328a(7) =334354a(8) =3559310a(9) =39838760a(10) =465743720a(11) =5658983108a(12) =71191948512a(13) =924554859776