[en] Simple expressions are obtained for diagonal matrix elements left-angle n,l|rβ|n,l right-angle, for arbitrary β and fixed l, where l=n-1, n-2, n-3, n-4, n-5, n-6, and n-7. Off-diagonal matrix elements are also calculated for the special cases left-angle n,l|rβ|n,l±1 right-angle and left-angle n,l|rβ|n,l±2 right-angle. The expressions are valid for any real β≥-(l+l'+2)