170766

Appears in sequences

• Number of trees on n nodes with forbidden limbs.at n=19A014265
• Number of trees on n nodes with forbidden limbs.at n=19A014266
• a(n) = s(n,n) + s(n,n-1) + s(n,n-2), where s(n,k) are the unsigned Stirling numbers of the first kind (see A132393).at n=34A308305