This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A220828 #11 Dec 15 2020 12:53:34 %S A220828 4,10,20,55,220,1040,5480,31420,190360,1202930,7848720,52543935, %T A220828 359182620,2498614620,17640615900,126142316865,912047139460, %U A220828 6658803466730,49035674140240,363881247076930,2718918248334300,20442286928323170,154564065790535680,1174669811887063830 %N A220828 Number of unrooted binary leaf-multi-labeled trees with n leaves on the label set [4]. %H A220828 Andrew Howroyd, <a href="/A220828/b220828.txt">Table of n, a(n) for n = 1..200</a> %H A220828 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 A220828 Column 4 of A339649. %K A220828 nonn %O A220828 1,1 %A A220828 _N. J. A. Sloane_, Dec 22 2012 %E A220828 Terms a(11) and beyond from _Andrew Howroyd_, Dec 14 2020