[ exp(9/11)*n! ].

Terms

a(0) =2a(1) =4a(2) =13a(3) =54a(4) =271a(5) =1631a(6) =11422a(7) =91380a(8) =822422a(9) =8224223a(10) =90466453a(11) =1085597445a(12) =14112766797a(13) =197578735167