Powered Terms in a Series: 11001. - Rick Mabry; Jody M. Lockhart (Am. Math. Mon., 2004)

Problem 11323. - Jody M. Lockhart; William P. Wardlaw (Am. Math. Mon., 2007)

On the Sum of Integer Powers of a Matrix: 11323 [2007, 835]. - Jody M. Lockhart; William P. Wardlaw; O. P. Lossers (Am. Math. Mon., 2009)