a(n) = prime(n)^2-3.

Terms

a(0) =1a(1) =6a(2) =22a(3) =46a(4) =118a(5) =166a(6) =286a(7) =358a(8) =526a(9) =838a(10) =958a(11) =1366a(12) =1678a(13) =1846a(14) =2206a(15) =2806a(16) =3478a(17) =3718a(18) =4486a(19) =5038a(20) =5326a(21) =6238a(22) =6886a(23) =7918a(24) =9406a(25) =10198a(26) =10606a(27) =11446a(28) =11878a(29) =12766