a(n) = n*(n+2)*(n+4)*(n+6).

Terms

a(0) =105a(1) =384a(2) =945a(3) =1920a(4) =3465a(5) =5760a(6) =9009a(7) =13440a(8) =19305a(9) =26880a(10) =36465a(11) =48384a(12) =62985a(13) =80640a(14) =101745a(15) =126720a(16) =156009a(17) =190080a(18) =229425a(19) =274560a(20) =326025a(21) =384384a(22) =450225a(23) =524160a(24) =606825a(25) =698880a(26) =801009a(27) =913920a(28) =1038345a(29) =1175040