Triangle read by rows: T(n,k) is the number of short bushes with n edges and having the leftmost leaf at height k (a short bush is an ordered tree with no nodes of outdegree 1).

A106489

Triangle read by rows: T(n,k) is the number of short bushes with n edges and having the leftmost leaf at height k (a short bush is an ordered tree with no nodes of outdegree 1).

Terms

    a(0) =1a(1) =1a(2) =2a(3) =1a(4) =4a(5) =2a(6) =9a(7) =5a(8) =1a(9) =21a(10) =12a(11) =3a(12) =51a(13) =30a(14) =9a(15) =1a(16) =127a(17) =76a(18) =25a(19) =4a(20) =323a(21) =196a(22) =69a(23) =14a(24) =1a(25) =835a(26) =512a(27) =189a(28) =44a(29) =5

External references