The only documentation I've come across mentions the latest version supported is Server 2012 R2.
Even Office Online for SharePoint 2016 says to install this on Server 2012 R2.
Supported operating systems for Office Online Server
You can run Office Online Server on the following operating systems:
- The 64-bitedition of Windows Server 2012 R2
Can Office Web Apps be installed on Server 2016 or even 2014?