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Bell, J.P., Burris, S.N. and Yeats, K.A. 2006. Counting Rooted Trees: The Universal Law $t(n)\,\sim\,C \rho^{-n} n^{-3/2}$. The Electronic Journal of Combinatorics. 13, 1 (Aug. 2006), #R63. DOI:https://doi.org/10.37236/1089.