a(n) = 64*n^2 + 8.

Terms

a(0) =72a(1) =264a(2) =584a(3) =1032a(4) =1608a(5) =2312a(6) =3144a(7) =4104a(8) =5192a(9) =6408a(10) =7752a(11) =9224a(12) =10824a(13) =12552a(14) =14408a(15) =16392a(16) =18504a(17) =20744a(18) =23112a(19) =25608a(20) =28232a(21) =30984a(22) =33864a(23) =36872a(24) =40008a(25) =43272a(26) =46664a(27) =50184a(28) =53832a(29) =57608