[ exp(5/14)*n! ].

Terms

a(0) =1a(1) =2a(2) =8a(3) =34a(4) =171a(5) =1029a(6) =7203a(7) =57626a(8) =518642a(9) =5186426a(10) =57050688a(11) =684608262a(12) =8899907410a(13) =124598703740