a(n) = (prime(n)^6 - prime(n)^2)/20.

Terms

a(0) =3a(1) =36a(2) =780a(3) =5880a(4) =88572a(5) =241332a(6) =1206864a(7) =2352276a(8) =7401768a(9) =29741124a(10) =44375136a(11) =128286252a(12) =237505128a(13) =316068060a(14) =538960656a(15) =1108217916a(16) =2109026508a(17) =2576018532a(18) =4522918884a(19) =6405013944a(20) =7566711048a(21) =12154372464a(22) =16347018324a(23) =24849064152a(24) =41648599776