%I #21 Feb 18 2023 10:36:50
%S 0,2,8,20,40,30,27
%N Erroneous version of A007290.
%C Included in accordance with OEIS policy of including erroneous but published sequences to serve as pointers to the correct versions.
%C Original name: Number of conjugacy classes of primitive words of length 3 over an alphabet of size n.
%H Dominique Perrin, and Christophe Reutenauer, <a href="https://arxiv.org/abs/1609.05438">Hall sets, Lazard sets and comma-free codes</a>, arXiv preprint arXiv:1609.05438 [math.CO] (2016).
%H Dominique Perrin, and Christophe Reutenauer, <a href="https://doi.org/10.1016/j.disc.2017.08.034">Hall sets, Lazard sets and comma-free codes</a>, Discrete Math., 341 (2018), 232-243.
%H Perrin, Dominique, and Christophe Reutenauer, <a href="/A294438/a294438.jpg">Hall sets, Lazard sets and comma-free codes</a>, Discrete Math., 341 (2018), 232-243. [Annotated scanned copy of page 236 only.
%K dead
%O 1,2