Triangular array read by rows. T(n,k) is the number of labeled digraphs on n nodes with exactly k self loops, n>=0, 0<=k<=n.

A334957

Triangular array read by rows. T(n,k) is the number of labeled digraphs on n nodes with exactly k self loops, n>=0, 0<=k<=n.

Terms

    a(0) =1a(1) =1a(2) =1a(3) =4a(4) =8a(5) =4a(6) =64a(7) =192a(8) =192a(9) =64a(10) =4096a(11) =16384a(12) =24576a(13) =16384a(14) =4096a(15) =1048576a(16) =5242880a(17) =10485760a(18) =10485760a(19) =5242880a(20) =1048576a(21) =1073741824a(22) =6442450944a(23) =16106127360a(24) =21474836480a(25) =16106127360a(26) =6442450944a(27) =1073741824

External references