a(n) = 70*n^2 + 1.

Terms

a(0) =1a(1) =71a(2) =281a(3) =631a(4) =1121a(5) =1751a(6) =2521a(7) =3431a(8) =4481a(9) =5671a(10) =7001a(11) =8471a(12) =10081a(13) =11831a(14) =13721a(15) =15751a(16) =17921a(17) =20231a(18) =22681a(19) =25271a(20) =28001a(21) =30871a(22) =33881a(23) =37031a(24) =40321a(25) =43751a(26) =47321a(27) =51031a(28) =54881a(29) =58871