a(n) = 1728*n - 408.

Terms

a(0) =1320a(1) =3048a(2) =4776a(3) =6504a(4) =8232a(5) =9960a(6) =11688a(7) =13416a(8) =15144a(9) =16872a(10) =18600a(11) =20328a(12) =22056a(13) =23784a(14) =25512a(15) =27240a(16) =28968a(17) =30696a(18) =32424a(19) =34152a(20) =35880a(21) =37608a(22) =39336a(23) =41064a(24) =42792a(25) =44520a(26) =46248a(27) =47976a(28) =49704a(29) =51432