a(n) = 529*n^2 - 23.

Terms

a(0) =506a(1) =2093a(2) =4738a(3) =8441a(4) =13202a(5) =19021a(6) =25898a(7) =33833a(8) =42826a(9) =52877a(10) =63986a(11) =76153a(12) =89378a(13) =103661a(14) =119002a(15) =135401a(16) =152858a(17) =171373a(18) =190946a(19) =211577a(20) =233266a(21) =256013a(22) =279818a(23) =304681a(24) =330602a(25) =357581a(26) =385618a(27) =414713a(28) =444866a(29) =476077