a(n) = 4*n*(n^2 + 2).

Terms

a(0) =12a(1) =48a(2) =132a(3) =288a(4) =540a(5) =912a(6) =1428a(7) =2112a(8) =2988a(9) =4080a(10) =5412a(11) =7008a(12) =8892a(13) =11088a(14) =13620a(15) =16512a(16) =19788a(17) =23472a(18) =27588a(19) =32160a(20) =37212a(21) =42768a(22) =48852a(23) =55488a(24) =62700a(25) =70512a(26) =78948a(27) =88032a(28) =97788a(29) =108240