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

Terms

a(0) =4a(1) =14a(2) =46a(3) =94a(4) =238a(5) =334a(6) =574a(7) =718a(8) =1054a(9) =1678a(10) =1918a(11) =2734a(12) =3358a(13) =3694a(14) =4414a(15) =5614a(16) =6958a(17) =7438a(18) =8974a(19) =10078a(20) =10654a(21) =12478a(22) =13774a(23) =15838a(24) =18814a(25) =20398a(26) =21214a(27) =22894a(28) =23758a(29) =25534