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A220826 Number of unrooted binary leaf-multi-labeled trees with n leaves on the label set [2]. 0
2, 3, 4, 6, 12, 31, 78, 234, 722, 2376 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..10.

V. P. Johnson, Enumeration Results on Leaf Labeled Trees, Ph. D. Dissertation, Univ. Southern Calif., 2012.

CROSSREFS

Sequence in context: A275448 A018405 A018419 * A095938 A018460 A018484

Adjacent sequences:  A220823 A220824 A220825 * A220827 A220828 A220829

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Dec 22 2012

STATUS

approved

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Last modified May 19 08:25 EDT 2019. Contains 323389 sequences. (Running on oeis4.)