158034

Appears in sequences

• Number of ways to paint some (possibly none or all) of the trees over all forests on n labeled nodes.at n=7A218691
• a(0) = 1 and a(n) = (1/n) * Sum_{k=1..n} 2^(n-k) * binomial(n,k) * binomial(n+(n-1)*k,k-1) for n > 0.at n=6A336712