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

Terms

a(0) =0a(1) =9a(2) =32a(3) =75a(4) =144a(5) =245a(6) =384a(7) =567a(8) =800a(9) =1089a(10) =1440a(11) =1859a(12) =2352a(13) =2925a(14) =3584a(15) =4335a(16) =5184a(17) =6137a(18) =7200a(19) =8379a(20) =9680a(21) =11109a(22) =12672a(23) =14375a(24) =16224a(25) =18225a(26) =20384a(27) =22707a(28) =25200a(29) =27869