[ exp(11/23)*n! ].

Terms

a(0) =1a(1) =3a(2) =9a(3) =38a(4) =193a(5) =1161a(6) =8130a(7) =65046a(8) =585422a(9) =5854220a(10) =64396427a(11) =772757129a(12) =10045842685a(13) =140641797590