6154473664

Appears in sequences

• Rooted simple digraphs on n unlabeled vertices.at n=6A353996
• Triangle read by rows: T(n,k) is the number of binary relations on a set of n objects, exactly k of which are self referencing, 0 <= k <= n.at n=29A384105
• Triangle read by rows: T(n,k) is the number of binary relations on a set of n objects, exactly k of which are self referencing, 0 <= k <= n.at n=34A384105