221520

Appears in sequences

• Number of n-node unlabeled rooted trees with thinning limbs and root outdegree (branching factor) 7.at n=16A244708
• a(n) is the least number k such that the equation phi(x) = k has exactly n solutions and the arithmetic mean of these solutions is an integer, or -1 if no such number exists.at n=38A389860