0,4

N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).

Foulds, L. R.; Robinson, R. W. Enumeration of binary phylogenetic trees. Combinatorial mathematics, VIII (Geelong, 1980), pp. 187-202, Lecture Notes in Math., 884, Springer, Berlin-New York, 1981. Math. Rev. 83a:05071.

Index entries for sequences related to rooted trees

Index entries for sequences related to trees

Sequence in context: A113347 A031972 A124577 this_sequence A145709 A034661 A094654

Adjacent sequences: A006675 A006676 A006677 this_sequence A006679 A006680 A006681

nonn

N. J. A. Sloane (njas(AT)research.att.com), Simon Plouffe (simon.plouffe(AT)gmail.com)