a(0)=1, a(n) = 8*n*(2*n-1).

Terms

a(0) =1a(1) =8a(2) =48a(3) =120a(4) =224a(5) =360a(6) =528a(7) =728a(8) =960a(9) =1224a(10) =1520a(11) =1848a(12) =2208a(13) =2600a(14) =3024a(15) =3480a(16) =3968a(17) =4488a(18) =5040a(19) =5624a(20) =6240a(21) =6888a(22) =7568a(23) =8280a(24) =9024a(25) =9800a(26) =10608a(27) =11448a(28) =12320a(29) =13224