a(n) = 16*n*(n+2).

Terms

a(0) =0a(1) =48a(2) =128a(3) =240a(4) =384a(5) =560a(6) =768a(7) =1008a(8) =1280a(9) =1584a(10) =1920a(11) =2288a(12) =2688a(13) =3120a(14) =3584a(15) =4080a(16) =4608a(17) =5168a(18) =5760a(19) =6384a(20) =7040a(21) =7728a(22) =8448a(23) =9200a(24) =9984a(25) =10800a(26) =11648a(27) =12528a(28) =13440a(29) =14384