a(n) = 1521*n^2 - 39.

Terms

a(0) =1482a(1) =6045a(2) =13650a(3) =24297a(4) =37986a(5) =54717a(6) =74490a(7) =97305a(8) =123162a(9) =152061a(10) =184002a(11) =218985a(12) =257010a(13) =298077a(14) =342186a(15) =389337a(16) =439530a(17) =492765a(18) =549042a(19) =608361a(20) =670722a(21) =736125a(22) =804570a(23) =876057a(24) =950586a(25) =1028157a(26) =1108770a(27) =1192425a(28) =1279122a(29) =1368861