Triangle read by rows: T(n,k) is number of leaves at level k in all noncrossing rooted trees on n+1 nodes.

A101372

Triangle read by rows: T(n,k) is number of leaves at level k in all noncrossing rooted trees on n+1 nodes.

Terms

    a(0) =1a(1) =2a(2) =2a(3) =7a(4) =10a(5) =4a(6) =30a(7) =50a(8) =32a(9) =8a(10) =143a(11) =260a(12) =208a(13) =88a(14) =16a(15) =728a(16) =1400a(17) =1280a(18) =704a(19) =224a(20) =32a(21) =3876a(22) =7752a(23) =7752a(24) =5016a(25) =2128a(26) =544a(27) =64a(28) =21318a(29) =43890

External references