Triangle read by rows: T(n,k) is the number of nonroot nodes of outdegree k (0<=k<=n-1) in all non-crossing trees with n edges.
A100400
Triangle read by rows: T(n,k) is the number of nonroot nodes of outdegree k (0<=k<=n-1) in all non-crossing trees with n edges.
Terms
- a(0) =1a(1) =4a(2) =2a(3) =21a(4) =12a(5) =3a(6) =120a(7) =72a(8) =24a(9) =4a(10) =715a(11) =440a(12) =165a(13) =40a(14) =5a(15) =4368a(16) =2730a(17) =1092a(18) =312a(19) =60a(20) =6a(21) =27132a(22) =17136a(23) =7140a(24) =2240a(25) =525a(26) =84a(27) =7a(28) =170544a(29) =108528
External references
- oeis: A100400