OEIS A000055: Unlabeled trees

We explore A000055, the OEIS entry for the number of unlabeled trees with n nodes. From the tiny first terms to the explosive growth at larger n, we’ll glimpse generating functions and asymptotics, and uncover the web of connections to rooted trees (A000081), two-gonal two trees, and tree-perfect graphs. We’ll also touch on surprising links to sphere circle arrangements and binary partitions, illustrating why label-free tree structures sit at a crossroads of combinatorics, geometry, and graph theory.

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