a(n) = 8*n^2.

Terms

a(0) =0a(1) =8a(2) =32a(3) =72a(4) =128a(5) =200a(6) =288a(7) =392a(8) =512a(9) =648a(10) =800a(11) =968a(12) =1152a(13) =1352a(14) =1568a(15) =1800a(16) =2048a(17) =2312a(18) =2592a(19) =2888a(20) =3200a(21) =3528a(22) =3872a(23) =4232a(24) =4608a(25) =5000a(26) =5408a(27) =5832a(28) =6272a(29) =6728