%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