587940

Appears in sequences

• Number of labeled n-node digraphs in which every node belongs to a directed cycle.at n=5A086366
• The number of 2 X 2 matrices with no real eigenvalues and whose entries are integers of absolute value at most n.at n=17A207259
• Triangular array read by rows. T(n,k) is the number of labeled digraphs on [n] with exactly k strongly connected components of size 1, n>=0, 0<=k<=n.at n=15A361592