Number of n-node rooted trees in which nine equals the maximal number of nodes in paths starting at a leaf and ending at the first branching node or at the root.

A318905

Number of n-node rooted trees in which nine equals the maximal number of nodes in paths starting at a leaf and ending at the first branching node or at the root.

Terms

    a(0) =1a(1) =1a(2) =3a(3) =8a(4) =22a(5) =60a(6) =167a(7) =465a(8) =1306a(9) =3680a(10) =10418a(11) =29582a(12) =84261a(13) =240581a(14) =688458a(15) =1973887a(16) =5669197a(17) =16307404a(18) =46973290a(19) =135474784a(20) =391164385a(21) =1130600056a(22) =3270921899a(23) =9471289877a(24) =27447106048a(25) =79598738454a(26) =231001452777a(27) =670812581033

External references