Triangular array read by rows: T(n,k) is the number of simple labeled graphs on n nodes with exactly k components where each component has at most one cycle; n>=1, 1<=k<=n.
A217756
Triangular array read by rows: T(n,k) is the number of simple labeled graphs on n nodes with exactly k components where each component has at most one cycle; n>=1, 1<=k<=n.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =4a(4) =3a(5) =1a(6) =31a(7) =19a(8) =6a(9) =1a(10) =347a(11) =195a(12) =55a(13) =10a(14) =1a(15) =4956a(16) =2707a(17) =720a(18) =125a(19) =15a(20) =1a(21) =85102a(22) =46319a(23) =12082a(24) =2030a(25) =245a(26) =21a(27) =1a(28) =1698712a(29) =930947
External references
- oeis: A217756