a(n) = (9*n)^3.

Terms

a(0) =0a(1) =729a(2) =5832a(3) =19683a(4) =46656a(5) =91125a(6) =157464a(7) =250047a(8) =373248a(9) =531441a(10) =729000a(11) =970299a(12) =1259712a(13) =1601613a(14) =2000376a(15) =2460375a(16) =2985984a(17) =3581577a(18) =4251528a(19) =5000211a(20) =5832000a(21) =6751269a(22) =7762392a(23) =8869743a(24) =10077696a(25) =11390625a(26) =12812904a(27) =14348907a(28) =16003008a(29) =17779581