A220825 Number of rooted gene trees with n leaves on the label set [5].

5, 15, 110, 965, 9376, 97775, 1068450, 12081605, 140160650, 1658936806, 19953117520, 243173225615, 2996409047690, 37268293795255, 467259511562294, 5899263870621530, 74934997567372640, 956996551484947905, 12280538887616448930, 158266409616840974927

Offset

1,1

Links

Andrew Howroyd, Table of n, a(n) for n = 1..200

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

Crossrefs

Column 5 of A319254.

Sequence in context: A077702 A088418 A080490 * A303230 A173736 A244298

Adjacent sequences: A220822 A220823 A220824 * A220826 A220827 A220828

Keyword

nonn

Author

N. J. A. Sloane, Dec 22 2012

Extensions

Terms a(11) and beyond from Andrew Howroyd, Sep 17 2018

Status

approved