[ exp(2/11)*n! ].

Terms

a(0) =1a(1) =2a(2) =7a(3) =28a(4) =143a(5) =863a(6) =6044a(7) =48359a(8) =435236a(9) =4352368a(10) =47876054a(11) =574512651a(12) =7468664474a(13) =104561302647