Irregular triangular array read by rows. T(n,k) is the number of weakly connected relations on n labeled nodes with k arcs. (n>=0, 0<=k<=n^2).
A217563
Irregular triangular array read by rows. T(n,k) is the number of weakly connected relations on n labeled nodes with k arcs. (n>=0, 0<=k<=n^2).
Terms
- a(0) =1a(1) =1a(2) =1a(3) =0a(4) =2a(5) =5a(6) =4a(7) =1a(8) =0a(9) =0a(10) =12a(11) =56a(12) =111a(13) =123a(14) =84a(15) =36a(16) =9a(17) =1a(18) =0a(19) =0a(20) =0a(21) =128a(22) =944a(23) =3264a(24) =7096a(25) =10936a(26) =12687a(27) =11400a(28) =8004a(29) =4368
External references
- oeis: A217563