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Number of unrooted binary leaf-multi-labeled trees with n leaves on the label set [4].
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%I #11 Dec 15 2020 12:53:34

%S 4,10,20,55,220,1040,5480,31420,190360,1202930,7848720,52543935,

%T 359182620,2498614620,17640615900,126142316865,912047139460,

%U 6658803466730,49035674140240,363881247076930,2718918248334300,20442286928323170,154564065790535680,1174669811887063830

%N Number of unrooted binary leaf-multi-labeled trees with n leaves on the label set [4].

%H Andrew Howroyd, <a href="/A220828/b220828.txt">Table of n, a(n) for n = 1..200</a>

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

%Y Column 4 of A339649.

%K nonn

%O 1,1

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

%E Terms a(11) and beyond from _Andrew Howroyd_, Dec 14 2020