a(n) = (32/2)*(n-1)*(n-2)*(n-3)*(n-4).

Terms

a(0) =0a(1) =0a(2) =0a(3) =0a(4) =384a(5) =1920a(6) =5760a(7) =13440a(8) =26880a(9) =48384a(10) =80640a(11) =126720a(12) =190080a(13) =274560a(14) =384384a(15) =524160a(16) =698880a(17) =913920a(18) =1175040a(19) =1488384a(20) =1860480a(21) =2298240a(22) =2808960a(23) =3400320a(24) =4080384a(25) =4857600a(26) =5740800a(27) =6739200a(28) =7862400a(29) =9120384