I am using
maxnames=5, along with
\parentcite in the text.
For papers with 3-5 authors, I would like them to appear with the full list the first time they are cited (as it does now), and with et al. the following times.
(Author 1, Author 2, Author 3 and Author 4, 2018)
(Author 1 et al., 2018)
In natbib, this seems to be done with the
longnamesfirst command, but I haven't found a way to do this biblatex.