Triangle read by rows: T(n,k) is the number of noncrossing trees with n edges in which the number of edges from the root to the first branch point is k.
A102892
Triangle read by rows: T(n,k) is the number of noncrossing trees with n edges in which the number of edges from the root to the first branch point is k.
Terms
- a(0) =1a(1) =0a(2) =1a(3) =1a(4) =0a(5) =2a(6) =5a(7) =3a(8) =0a(9) =4a(10) =25a(11) =16a(12) =6a(13) =0a(14) =8a(15) =130a(16) =83a(17) =32a(18) =12a(19) =0a(20) =16a(21) =700a(22) =442a(23) =166a(24) =64a(25) =24a(26) =0a(27) =32a(28) =3876a(29) =2420
External references
- oeis: A102892