a(n) = 9*n^2 - 11*n + 3.

Terms

a(0) =1a(1) =17a(2) =51a(3) =103a(4) =173a(5) =261a(6) =367a(7) =491a(8) =633a(9) =793a(10) =971a(11) =1167a(12) =1381a(13) =1613a(14) =1863a(15) =2131a(16) =2417a(17) =2721a(18) =3043a(19) =3383a(20) =3741a(21) =4117a(22) =4511a(23) =4923a(24) =5353a(25) =5801a(26) =6267a(27) =6751a(28) =7253a(29) =7773