In the fall of 2019 I taught a course on combinatorics based on combinatorial species and their generating functions. These free books served as reading material:
Toward the end of this course I got so interested in the combinatorics of random permutations that I wrote a series of articles about them:
In 2025 I taught a shorter summer course on species in Athens, with notes available here or as a slightly ugly single PDF file here.
Here are hand-written notes for each class of the fall 2019 seminar, taken by Christian Williams, mixed in with notes on a more advanced seminar in which we developed some of the category-theoretic ideas in more detail.