104456

Appears in sequences

• a(n) = (n+1)*(a(n-1)/n + a(n-2)), with a(0)=1, a(1)=2.at n=10A013989
• Triangle read by rows: T(n,k) is the number of unlabeled digraphs on n nodes with k arcs up to reversing the arcs, k=0..n*(n-1).at n=60A126066
• Triangle read by rows: T(n,k) is the number of unlabeled digraphs on n nodes with k arcs up to reversing the arcs, k=0..n*(n-1).at n=62A126066
• Number of labeled simple graphs with n vertices and exactly n - 1 endpoints (vertices of degree 1).at n=11A327370