a(1)=1, a(n) = n*8^(n-1) + a(n-1).

Terms

a(0) =1a(1) =17a(2) =209a(3) =2257a(4) =22737a(5) =219345a(6) =2054353a(7) =18831569a(8) =169826513a(9) =1512003793a(10) =13323163857a(11) =116402378961