a(n) = 80*n^2 + 1.

Terms

a(0) =1a(1) =81a(2) =321a(3) =721a(4) =1281a(5) =2001a(6) =2881a(7) =3921a(8) =5121a(9) =6481a(10) =8001a(11) =9681a(12) =11521a(13) =13521a(14) =15681a(15) =18001a(16) =20481a(17) =23121a(18) =25921a(19) =28881a(20) =32001a(21) =35281a(22) =38721a(23) =42321a(24) =46081a(25) =50001a(26) =54081a(27) =58321a(28) =62721a(29) =67281