a(n) = (prime(n)^5 - prime(n))/2.

Terms

a(0) =15a(1) =120a(2) =1560a(3) =8400a(4) =80520a(5) =185640a(6) =709920a(7) =1238040a(8) =3218160a(9) =10255560a(10) =14314560a(11) =34671960a(12) =57928080a(13) =73504200a(14) =114672480a(15) =209097720a(16) =357462120a(17) =422298120a(18) =675062520a(19) =902114640a(20) =1036535760a(21) =1538528160a(22) =1969520280a(23) =2792029680