E.g.f. satisfies A(x) = 1 + x^3/6*exp(x*A(x)).

Terms

a(0) =1a(1) =0a(2) =0a(3) =1a(4) =4a(5) =10a(6) =20a(7) =175a(8) =2296a(9) =20244a(10) =134520a(11) =1016565a(12) =13527580a(13) =209970046a(14) =2785823404a(15) =33569936855a(16) =467250784560