a(n) = (3*n + 2)^9.A016797a(n) = (3*n + 2)^9.Terms a(0) =512a(1) =1953125a(2) =134217728a(3) =2357947691a(4) =20661046784a(5) =118587876497a(6) =512000000000External referencesoeis: A016797