a(n) = 1296*n^2 + 36.

Terms

a(0) =36a(1) =1332a(2) =5220a(3) =11700a(4) =20772a(5) =32436a(6) =46692a(7) =63540a(8) =82980a(9) =105012a(10) =129636a(11) =156852a(12) =186660a(13) =219060a(14) =254052a(15) =291636a(16) =331812a(17) =374580a(18) =419940a(19) =467892a(20) =518436a(21) =571572a(22) =627300a(23) =685620a(24) =746532a(25) =810036a(26) =876132a(27) =944820a(28) =1016100a(29) =1089972