Triangle T(n,k) of number of loopless multigraphs with n labeled edges and k labeled vertices and without isolated vertices, n >= 1; 2 <= k <= 2*n.
A122193
Triangle T(n,k) of number of loopless multigraphs with n labeled edges and k labeled vertices and without isolated vertices, n >= 1; 2 <= k <= 2*n.
Terms
- a(0) =1a(1) =1a(2) =6a(3) =6a(4) =1a(5) =24a(6) =114a(7) =180a(8) =90a(9) =1a(10) =78a(11) =978a(12) =4320a(13) =8460a(14) =7560a(15) =2520a(16) =1a(17) =240a(18) =6810a(19) =63540a(20) =271170a(21) =604800a(22) =730800a(23) =453600a(24) =113400a(25) =1a(26) =726a(27) =43746a(28) =774000a(29) =6075900
External references
- oeis: A122193