[ exp(3/10)*n! ].

Terms

a(0) =1a(1) =2a(2) =8a(3) =32a(4) =161a(5) =971a(6) =6803a(7) =54426a(8) =489836a(9) =4898367a(10) =53882044a(11) =646584528a(12) =8405598871a(13) =117678384205