a(n) = 1728*n - 1320.

Terms

a(0) =408a(1) =2136a(2) =3864a(3) =5592a(4) =7320a(5) =9048a(6) =10776a(7) =12504a(8) =14232a(9) =15960a(10) =17688a(11) =19416a(12) =21144a(13) =22872a(14) =24600a(15) =26328a(16) =28056a(17) =29784a(18) =31512a(19) =33240a(20) =34968a(21) =36696a(22) =38424a(23) =40152a(24) =41880a(25) =43608a(26) =45336a(27) =47064a(28) =48792a(29) =50520