Can anyone point me to a gallery (printed or online) of unlabelled trees, sorted according to their order (i.e., number of vertices)? That is, for each order n in oeis.org/A000055 (up to maybe n=11 or so) I'd like to see a visualization of all the trees.
I found Gary Fredericks' online database Small Simple Graphs but there are a few problems which make it unsuitable for my purposes: 1) It's for graphs in general as opposed to trees. (Though maybe there is some way of using the filters in this tool to suppress the graphs with cycles?) 2) It works only for n up to 9. 3) It shows only five graphs at a time, though I'd like to see all the trees for a given n on the same web page (or printed page).
Alternatively can someone point me to some code which can automatically generate images of such trees, preferably in a vector format? Then I could arrange them myself into a single web page or LaTeX document.