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

Terms

a(0) =1a(1) =1a(2) =1a(3) =2a(4) =9a(5) =41a(6) =191a(7) =1191a(8) =9353a(9) =77897a(10) =704861a(11) =7352621a(12) =85323921a(13) =1058023825a(14) =14155416003a(15) =206100005931