a(n) = 24*n^2.

Terms

a(0) =0a(1) =24a(2) =96a(3) =216a(4) =384a(5) =600a(6) =864a(7) =1176a(8) =1536a(9) =1944a(10) =2400a(11) =2904a(12) =3456a(13) =4056a(14) =4704a(15) =5400a(16) =6144a(17) =6936a(18) =7776a(19) =8664a(20) =9600a(21) =10584a(22) =11616a(23) =12696a(24) =13824a(25) =15000a(26) =16224a(27) =17496a(28) =18816a(29) =20184