a(n) = 648*n^2 - 72*n + 1.

Terms

a(0) =577a(1) =2449a(2) =5617a(3) =10081a(4) =15841a(5) =22897a(6) =31249a(7) =40897a(8) =51841a(9) =64081a(10) =77617a(11) =92449a(12) =108577a(13) =126001a(14) =144721a(15) =164737a(16) =186049a(17) =208657a(18) =232561a(19) =257761a(20) =284257a(21) =312049a(22) =341137a(23) =371521a(24) =403201a(25) =436177a(26) =470449a(27) =506017a(28) =542881a(29) =581041