That code will error out when it first tries to raise the matrix to a power. When you give a cell array of values as the list of values for a "for" loop, the loop variable is set to a cell containing each element in the list, so you would be trying to first raise A to {1} rather than to 1.
If you had used [] instead of {}. the code shown would raise to each power and display the result, but would not do anything with the results other than to display them.
Perhaps your code looks different than what you posted?
