a(n) = 324n^2 - 2n.

Terms

a(0) =322a(1) =1292a(2) =2910a(3) =5176a(4) =8090a(5) =11652a(6) =15862a(7) =20720a(8) =26226a(9) =32380a(10) =39182a(11) =46632a(12) =54730a(13) =63476a(14) =72870a(15) =82912a(16) =93602a(17) =104940a(18) =116926a(19) =129560a(20) =142842a(21) =156772a(22) =171350a(23) =186576a(24) =202450a(25) =218972a(26) =236142a(27) =253960a(28) =272426a(29) =291540