a(n) = (10*n + 9)^3.

Terms

a(0) =729a(1) =6859a(2) =24389a(3) =59319a(4) =117649a(5) =205379a(6) =328509a(7) =493039a(8) =704969a(9) =970299a(10) =1295029a(11) =1685159a(12) =2146689a(13) =2685619a(14) =3307949a(15) =4019679a(16) =4826809a(17) =5735339a(18) =6751269a(19) =7880599a(20) =9129329a(21) =10503459a(22) =12008989