Očitno je custom funkcija; poizkusi tole:
Press ALT-F11, double click on the sheet of interest, and see if there is any code in the right-hand pane. If nothing is there, double click on the "This Workbook" entry and check again.
There is no TABLE built-in function in Excel.
If you find it, it'll probably look something like..
Function TABLE()
'code here
End Function