a(n) = 4*prime(n)^2+1.

Terms

a(0) =17a(1) =37a(2) =101a(3) =197a(4) =485a(5) =677a(6) =1157a(7) =1445a(8) =2117a(9) =3365a(10) =3845a(11) =5477a(12) =6725a(13) =7397a(14) =8837a(15) =11237a(16) =13925a(17) =14885a(18) =17957a(19) =20165a(20) =21317a(21) =24965a(22) =27557a(23) =31685a(24) =37637a(25) =40805a(26) =42437a(27) =45797a(28) =47525a(29) =51077