(prime(prime(n))^4-1)/120.

Terms

a(0) =122a(1) =696a(2) =7696a(3) =23548a(4) =100978a(5) =167926a(6) =395486a(7) =1176318a(8) =2167872a(9) =5063110a(10) =8555214a(11) =11090528a(12) =16517662a(13) =28111688a(14) =49061162a(15) =53452066a(16) =100030106a(17) =129395024a(18) =151176056a(19) =215474680a(20) =287559576a(21) =376376462a(22) =559358038a(23) =746050214a(24) =837244558a(25) =989398298a(26) =1072817980