[ exp(9/13)*n! ].

Terms

a(0) =1a(1) =3a(2) =11a(3) =47a(4) =239a(5) =1438a(6) =10071a(7) =80572a(8) =725150a(9) =7251509a(10) =79766608a(11) =957199305a(12) =12443590965a(13) =174210273518