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A220823 Number of rooted gene trees with n leaves on the label set [3]. 3


%S 3,6,28,156,948,6206,42504,301548,2195100,16307598,123128940,

%T 942125110,7289062320,56926578912,448186662992,3553364598786,

%U 28345260090444,227337020914322,1832102040838776,14828608892376288,120485979704314764,982422914174633154,8036158136627878572

%N Number of rooted gene trees with n leaves on the label set [3].

%H Andrew Howroyd, <a href="/A220823/b220823.txt">Table of n, a(n) for n = 1..200</a>

%H V. P. Johnson, <a href="http://people.math.sc.edu/czabarka/Theses/JohnsonThesis.pdf">Enumeration Results on Leaf Labeled Trees</a>, Ph. D. Dissertation, Univ. Southern Calif., 2012.

%Y Column 3 of A319254.

%K nonn

%O 1,1

%A _N. J. A. Sloane_, Dec 22 2012

%E Terms a(11) and beyond from _Andrew Howroyd_, Sep 17 2018

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Last modified January 18 19:40 EST 2020. Contains 331029 sequences. (Running on oeis4.)