a(n) = 8n^2 - 12n + 1.

Terms

a(0) =9a(1) =37a(2) =81a(3) =141a(4) =217a(5) =309a(6) =417a(7) =541a(8) =681a(9) =837a(10) =1009a(11) =1197a(12) =1401a(13) =1621a(14) =1857a(15) =2109a(16) =2377a(17) =2661a(18) =2961a(19) =3277a(20) =3609a(21) =3957a(22) =4321a(23) =4701a(24) =5097a(25) =5509a(26) =5937a(27) =6381a(28) =6841a(29) =7317