p*(p+2)/3 where p and p+4 are primes.

Terms

a(0) =5a(1) =21a(2) =65a(3) =133a(4) =481a(5) =645a(6) =1541a(7) =2133a(8) =3201a(9) =3605a(10) =4033a(11) =5461a(12) =8965a(13) =12545a(14) =16725a(15) =17633a(16) =25761a(17) =31621a(18) =32865a(19) =40833a(20) =48133a(21) =52801a(22) =64533a(23) =69921a(24) =71765a(25) =79381a(26) =83333a(27) =125665a(28) =138245a(29) =151425