a(n) = 6*n^3.

Terms

a(0) =0a(1) =6a(2) =48a(3) =162a(4) =384a(5) =750a(6) =1296a(7) =2058a(8) =3072a(9) =4374a(10) =6000a(11) =7986a(12) =10368a(13) =13182a(14) =16464a(15) =20250a(16) =24576a(17) =29478a(18) =34992a(19) =41154a(20) =48000a(21) =55566a(22) =63888a(23) =73002a(24) =82944a(25) =93750a(26) =105456a(27) =118098a(28) =131712a(29) =146334