In general, parentheses should be in the font style of the context of a sentence, not in the format of the text within the parentheses. For example, the text within parentheses might be italic, but the parentheses themselves would be regular type if the surrounding text is regular type. An exception to this is “(continued),” which is used for tables that continue on the next page or index subentries that continue in the next column or on the next page. In this usage, the parentheses and the word “continued” are italic.

Microsoft style

For a single-column array, use INDEX (array,row_num).