a(n) = numerator of ((n + 4)! - (n - 4)!)/(n!).

Terms

a(0) =40319a(1) =362879a(2) =1814399a(3) =6652799a(4) =19958399a(5) =51891839a(6) =121080959a(7) =259459199a(8) =518918399a(9) =980179199a(10) =1764322559a(11) =3047466239a(12) =5079110399a(13) =8204716799a(14) =12893126399a(15) =19769460479a(16) =29654190719a(17) =43609103999a(18) =62990927999