a(n) = 289*n^2 + 17.

Terms

a(0) =17a(1) =306a(2) =1173a(3) =2618a(4) =4641a(5) =7242a(6) =10421a(7) =14178a(8) =18513a(9) =23426a(10) =28917a(11) =34986a(12) =41633a(13) =48858a(14) =56661a(15) =65042a(16) =74001a(17) =83538a(18) =93653a(19) =104346a(20) =115617a(21) =127466a(22) =139893a(23) =152898a(24) =166481a(25) =180642a(26) =195381a(27) =210698a(28) =226593a(29) =243066