a(n) = 40*n^2 + 1.

Terms

a(0) =1a(1) =41a(2) =161a(3) =361a(4) =641a(5) =1001a(6) =1441a(7) =1961a(8) =2561a(9) =3241a(10) =4001a(11) =4841a(12) =5761a(13) =6761a(14) =7841a(15) =9001a(16) =10241a(17) =11561a(18) =12961a(19) =14441a(20) =16001a(21) =17641a(22) =19361a(23) =21161a(24) =23041a(25) =25001a(26) =27041a(27) =29161a(28) =31361a(29) =33641