As you can see, the navigation is 'home-made'. The List_Navigation Web Block in RichWidgets doesn't seem to play nice with filtered aggregates so I (roughly) simulated it's functionality. They are pretty self-explanitory. I just threw this together so I'm sure there is a better way. If you update it and make it better, please don't hesitate to share!
I've tested it with up to 2,400 rows of data paging 5, 10, 25, and 50 rows. It seems to work ok. This seems to work fine for web applications, but I'm planning to rethink the logic for mobile to cut down on the amount of database requests.
Updated for OutSystems 11.