It was a massive pain in the ass to get Seq installed, and up and running on Windows Server Core using Docker on Windows with Windows containers, so this is the result of a lot of my trial and error.
I was going to be doing a presentation on the way that Coolblue uses Docker & Seq, and it took me forever to get this "just right" - you can check out the repo for yourself if you're interested over here
Usage is simple, just use
docker run and open port
5341 like so:
docker run -d -t -p 5341:5341 pheonix25/servercore-seq