Valery A. Liskovets. Exact enumeration of acyclic deterministic automata. Discrete Applied Mathematics, 154(3):537-551, 2006. [doi]
@article{Liskovets06,
title = {Exact enumeration of acyclic deterministic automata},
author = {Valery A. Liskovets},
year = {2006},
doi = {10.1016/j.dam.2005.06.009},
url = {http://dx.doi.org/10.1016/j.dam.2005.06.009},
researchr = {https://researchr.org/publication/Liskovets06},
cites = {0},
citedby = {0},
journal = {Discrete Applied Mathematics},
volume = {154},
number = {3},
pages = {537-551},
}