[ exp(1/11)*n! ].

Terms

a(0) =1a(1) =2a(2) =6a(3) =26a(4) =131a(5) =788a(6) =5519a(7) =44157a(8) =397415a(9) =3974150a(10) =43715659a(11) =524587913a(12) =6819642881a(13) =95475000342