[ exp(10/13)*n! ].

Terms

a(0) =2a(1) =4a(2) =12a(3) =51a(4) =258a(5) =1553a(6) =10876a(7) =87014a(8) =783133a(9) =7831333a(10) =86144666a(11) =1033736003a(12) =13438568048a(13) =188139952678