a(n) = ((n-th prime)^6-(n-th prime)^4)/3.

Terms

a(0) =16a(1) =216a(2) =5000a(3) =38416a(4) =585640a(5) =1599416a(6) =8018016a(7) =15638520a(8) =49252016a(9) =198038680a(10) =295526720a(11) =854617416a(12) =1582426160a(13) =2105981416a(14) =3591445216a(15) =7385490216a(16) =14056138760a(17) =17168842840a(18) =30146077016a(19) =42691624080a(20) =50435276016