217045

Appears in sequences

• Number of n-bead necklaces with 5 colors.at n=9A001869
• Number of ways to color vertices of a 9-gon using <= n colors, allowing only rotations.at n=5A054623
• Triangle read by rows: row n (n >= 1) contains the numbers T(n,k) = Sum_{d|n} phi(d)*k^(n/d)/n, for k=1..n.at n=40A054631
• a(n) = -(1/n) * Sum_{d|n} phi(n/d) * (-5)^d.at n=8A343467