Ceiling(exp(n)/n^3).

Terms

a(0) =3a(1) =1a(2) =1a(3) =1a(4) =2a(5) =2a(6) =4a(7) =6a(8) =12a(9) =23a(10) =45a(11) =95a(12) =202a(13) =439a(14) =969a(15) =2170a(16) =4917a(17) =11259a(18) =26022a(19) =60646a(20) =142406a(21) =336675a(22) =800921a(23) =1916170a(24) =4608314a(25) =11136187a(26) =27030852a(27) =65882702a(28) =161192928a(29) =395795355