Expansion of e.g.f. exp(A006351(x)).

Terms

a(0) =1a(1) =1a(2) =3a(3) =15a(4) =109a(5) =1053a(6) =12767a(7) =186763a(8) =3204313a(9) =63128665a(10) =1404963387a(11) =34867190823a(12) =954800951749