The number in the brackets is the number of "elements" to allocate for an array. Since elements are indexed beginning with 0, then the last element would be indexed at one less than the number of elements.
So no, you don't have 24 extra lists. If row = 11 and column = 11, thats an array of 11*11 lists, indexed from 0 to 10.
Local MyArray:int[4] 'create 4 elements MyArray[0] = 0 'Access first element MyArray[1] = 1 'Access Second element MyArray[2] = 2 'Access Third Element MyArray[3] = 4 'Access Forth Element
So no, you don't have 24 extra lists. If row = 11 and column = 11, thats an array of 11*11 lists, indexed from 0 to 10.