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

Terms

a(0) =0a(1) =64a(2) =256a(3) =576a(4) =1024a(5) =1600a(6) =2304a(7) =3136a(8) =4096a(9) =5184a(10) =6400a(11) =7744a(12) =9216a(13) =10816a(14) =12544a(15) =14400a(16) =16384a(17) =18496a(18) =20736a(19) =23104a(20) =25600a(21) =28224a(22) =30976a(23) =33856a(24) =36864a(25) =40000a(26) =43264a(27) =46656a(28) =50176a(29) =53824