Triangle T(n,k) (n >= 2, 2 <= k <= n-1 if n > 2) giving number of non-crossing trees with n nodes and k endpoints.
A072247
Triangle T(n,k) (n >= 2, 2 <= k <= n-1 if n > 2) giving number of non-crossing trees with n nodes and k endpoints.
Terms
- a(0) =1a(1) =3a(2) =8a(3) =4a(4) =20a(5) =30a(6) =5a(7) =48a(8) =144a(9) =75a(10) =6a(11) =112a(12) =560a(13) =595a(14) =154a(15) =7a(16) =256a(17) =1920a(18) =3440a(19) =1848a(20) =280a(21) =8a(22) =576a(23) =6048a(24) =16380a(25) =14994a(26) =4788a(27) =468a(28) =9a(29) =1280
External references
- oeis: A072247