a(n) = floor(n!*(e - 1/24)).

Terms

a(0) =2a(1) =2a(2) =5a(3) =16a(4) =64a(5) =321a(6) =1927a(7) =13490a(8) =107921a(9) =971290a(10) =9712901a(11) =106841912a(12) =1282102945a(13) =16667338286a(14) =233342736005