a(n) = 52*n^2 + 1.

Terms

a(0) =1a(1) =53a(2) =209a(3) =469a(4) =833a(5) =1301a(6) =1873a(7) =2549a(8) =3329a(9) =4213a(10) =5201a(11) =6293a(12) =7489a(13) =8789a(14) =10193a(15) =11701a(16) =13313a(17) =15029a(18) =16849a(19) =18773a(20) =20801a(21) =22933a(22) =25169a(23) =27509a(24) =29953a(25) =32501a(26) =35153a(27) =37909a(28) =40769a(29) =43733