a(n) = 3^(3n+2).A013733a(n) = 3^(3n+2).Terms a(0) =9a(1) =243a(2) =6561a(3) =177147a(4) =4782969a(5) =129140163a(6) =3486784401a(7) =94143178827External referencesoeis: A013733