[ exp(16/19)*n! ].

Terms

a(0) =2a(1) =4a(2) =13a(3) =55a(4) =278a(5) =1671a(6) =11699a(7) =93592a(8) =842334a(9) =8423347a(10) =92656819a(11) =1111881829a(12) =14454463785a(13) =202362492994