A simple method for calculating the power of an ordinary square matrix is given by using the Jordan normal form of matrix and its similar transformation matrix.
刘敬. n阶方阵幂的另一种简便求法[J].重庆工商大学学报(自然科学版),1999,(2): Liu Jing. A Simple Method for Calculating the Power of a Square Matrix[J]. Journal of Chongqing Technology and Business University(Natural Science Edition),1999,(2):