a(n) = (9*n + 7)^5.

Terms

a(0) =16807a(1) =1048576a(2) =9765625a(3) =45435424a(4) =147008443a(5) =380204032a(6) =844596301a(7) =1680700000a(8) =3077056399a(9) =5277319168a(10) =8587340257a(11) =13382255776a(12) =20113571875a(13) =29316250624a(14) =41615795893a(15) =57735339232a(16) =78502725751a(17) =104857600000a(18) =137858491849a(19) =178689902368a(20) =228669389707a(21) =289254654976a(22) =362050628125