19173960domain: NAppears in sequencesa(n) = Sum_{k=1..n} n^k.at n=8A031972Number of integers from 1 to 10^(n+1)-1 that lack 0 and 1 as a digit.at n=7A052379Number of 7-bead necklaces of n colors allowing reversal, with no adjacent beads having the same color.at n=16A208545a(n) = Sum_{k=1..8} n^k.at n=8A228292