324n^2 + 2n.

Terms

a(0) =326a(1) =1300a(2) =2922a(3) =5192a(4) =8110a(5) =11676a(6) =15890a(7) =20752a(8) =26262a(9) =32420a(10) =39226a(11) =46680a(12) =54782a(13) =63532a(14) =72930a(15) =82976a(16) =93670a(17) =105012a(18) =117002a(19) =129640a(20) =142926a(21) =156860a(22) =171442a(23) =186672a(24) =202550a(25) =219076a(26) =236250a(27) =254072a(28) =272542a(29) =291660