[ exp(8/17)*n! ].

Terms

a(0) =1a(1) =3a(2) =9a(3) =38a(4) =192a(5) =1152a(6) =8068a(7) =64549a(8) =580947a(9) =5809475a(10) =63904227a(11) =766850734a(12) =9969059549a(13) =139566833690