Triangle read by rows: T(n,k) is the number of labeled 3-regular digraphs (multiple arcs and loops allowed) on n nodes with k components.

A344379

Triangle read by rows: T(n,k) is the number of labeled 3-regular digraphs (multiple arcs and loops allowed) on n nodes with k components.

Terms

    a(0) =1a(1) =3a(2) =1a(3) =45a(4) =9a(5) =1a(6) =1782a(7) =207a(8) =18a(9) =1a(10) =142164a(11) =10260a(12) =585a(13) =30a(14) =1a(15) =19943830a(16) =953424a(17) =35235a(18) =1305a(19) =45a(20) =1a(21) =4507660380a(22) =151369792a(23) =3731049a(24) =93555a(25) =2520a(26) =63a(27) =1a(29) =38205961380a(30) =657600076

External references