Expansion of e.g.f. exp(3*(exp(x) - 1 - x)).

Terms

a(0) =1a(1) =0a(2) =3a(3) =3a(4) =30a(5) =93a(6) =633a(7) =3342a(8) =22809a(9) =156063a(10) =1183872a(11) =9453711a(12) =80455125a(13) =721576560a(14) =6809391111a(15) =67332650007a(16) =695777512638