Unknown Formula

Hi All,

I have received a normal(xlsx) excel document, and it contains a formula that i cannot for the life of me figure out what it is doing. The formula is not know to excel and there is no visual basic function in the document. The formula is an array and looks like this {=TABLE(,C11)}. When i press F2 to enter the cell and then press ctl+shift+enter to submit the array it gives me an error, but if i press esc it accepts the function as it was previously. How can i figure out what the function is? I have to believe that the excel file has to be saving it somewhere, but i am not sure where. Any help is greatly appreciated.

Thank you very much!