Array read by rows: T(n,k) is the number of directed multigraphs with loops with n arcs, k vertices, and no vertex of degree 0.

A136564

Array read by rows: T(n,k) is the number of directed multigraphs with loops with n arcs, k vertices, and no vertex of degree 0.

Terms

    a(0) =1a(1) =1a(2) =1a(3) =5a(4) =4a(5) =1a(6) =1a(7) =9a(8) =21a(9) =16a(10) =4a(11) =1a(12) =1a(13) =18a(14) =71a(15) =108a(16) =71a(17) =22a(18) =4a(19) =1a(20) =1a(21) =27a(22) =194a(23) =491a(24) =557a(25) =326a(26) =101a(27) =22a(28) =4a(29) =1

External references