get(foundcount) shows the number in a selection.
You can gry using a global calculated field with that as the calculation and set it to refresh when needed.
If that doesn't work then create a script that puts it into a global field or variable and use that script as a trigger for on record load on record enter, etc. You'll have to test to see which works in your procedures.
You could also use some of the gets to show:
Record Nbr of xx selected of xx in table
Filemaker 12 makes it even easier as you can insert the Found Count into a variable using in layout mode: Insert:Other Symbol...:FoundCount and so on.
For FileMaker 11 and older, I'd define an unstored calculation field with get ( foundCount ) and then insert that on the layout as a merge field along with layout text to produce:
You are currently viewing <<YourCalcFieldNameHere>> records.