Infinite square array: T(n,k) = number of directed multigraphs with loops with n arcs and k vertices; read by falling antidiagonals.

A138107

Infinite square array: T(n,k) = number of directed multigraphs with loops with n arcs and k vertices; read by falling antidiagonals.

Terms

    a(0) =1a(1) =1a(2) =0a(3) =1a(4) =1a(5) =0a(6) =1a(7) =2a(8) =1a(9) =0a(10) =1a(11) =2a(12) =6a(13) =1a(14) =0a(15) =1a(16) =2a(17) =10a(18) =10a(19) =1a(20) =0a(21) =1a(22) =2a(23) =11a(24) =31a(25) =19a(26) =1a(27) =0a(28) =1a(29) =2

External references