[ exp(10/17)*n! ].

Terms

a(0) =1a(1) =3a(2) =10a(3) =43a(4) =216a(5) =1296a(6) =9076a(7) =72608a(8) =653477a(9) =6534771a(10) =71882481a(11) =862589776a(12) =11213667090a(13) =156991339265