A138352 Table read by antidiagonals: T(n,k) is the number of transitive directed multigraphs with loops with n arcs and k vertices.

1, 1, 0, 1, 1, 0, 1, 2, 1, 0, 1, 2, 5, 1, 0, 1, 2, 8, 8, 1, 0, 1, 2, 9, 20, 14, 1, 0, 1, 2, 9, 29

Offset: 0

Author

Benoit Jubin, May 07 2008

Keywords

• nonn
• tabl

Comments

Partial sums of the rows of A139623, i.e., T(n,k) = sum(T139623(n,p),p=0..k).

If k>=2n, T(n,k) = A139628(n).

Crossrefs

Cf. A138107.