Andrew Gainer-Dewar, Ira M. Gessel. Counting unlabeled k-trees. Journal of Combinatorial Theory, Series A, 126:177-193, 2014. [doi]
@article{Gainer-DewarG14-0,
title = {Counting unlabeled k-trees},
author = {Andrew Gainer-Dewar and Ira M. Gessel},
year = {2014},
doi = {10.1016/j.jcta.2014.05.002},
url = {http://dx.doi.org/10.1016/j.jcta.2014.05.002},
researchr = {https://researchr.org/publication/Gainer-DewarG14-0},
cites = {0},
citedby = {0},
journal = {Journal of Combinatorial Theory, Series A},
volume = {126},
pages = {177-193},
}