a(n) = (prime(n)^4 - prime(n))/2.

Terms

a(0) =7a(1) =39a(2) =310a(3) =1197a(4) =7315a(5) =14274a(6) =41752a(7) =65151a(8) =139909a(9) =353626a(10) =461745a(11) =937062a(12) =1412860a(13) =1709379a(14) =2439817a(15) =3945214a(16) =6058651a(17) =6922890a(18) =10075527a(19) =12705805a(20) =14199084a(21) =19475001a(22) =23729119a(23) =31371076a(24) =44264592a(25) =52030150a(26) =56275389