An Identity Involving Derangements: 10643.
David CallanKnut DaleIvar SkauJohn Henry SteelmanJany C. BinzRobin J. ChapmanF. HerzigAndré KündgenReiner MartinJosé Heber NietoO. A. SalehS. ByrdEdward F. SchmeichelIsaac SofairMichael VowePublished in: Am. Math. Mon. (2000)