a(n) = 2025*n^2 - 649*n + 52.

Terms

a(0) =1428a(1) =6854a(2) =16330a(3) =29856a(4) =47432a(5) =69058a(6) =94734a(7) =124460a(8) =158236a(9) =196062a(10) =237938a(11) =283864a(12) =333840a(13) =387866a(14) =445942a(15) =508068a(16) =574244a(17) =644470a(18) =718746a(19) =797072a(20) =879448a(21) =965874a(22) =1056350a(23) =1150876a(24) =1249452a(25) =1352078a(26) =1458754a(27) =1569480a(28) =1684256