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

A318900

Number of n-node rooted trees in which four 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) =21a(5) =56a(6) =152a(7) =413a(8) =1131a(9) =3113a(10) =8603a(11) =23861a(12) =66386a(13) =185190a(14) =517807a(15) =1450836a(16) =4072474a(17) =11450141a(18) =32240466a(19) =90901507a(20) =256605905a(21) =725176409a(22) =2051455548a(23) =5808817638a(24) =16462274560a(25) =46691893949a(26) =132531324274a(27) =376443234567

External references