[ exp(19/20)*n! ].

Terms

a(0) =2a(1) =5a(2) =15a(3) =62a(4) =310a(5) =1861a(6) =13031a(7) =104255a(8) =938302a(9) =9383023a(10) =103213255a(11) =1238559063a(12) =16101267831a(13) =225417749638