As reported by Pegg 2005. The discovery of this error was credited by Pegg to Gabor Ellmann. Pegg, Ed Jr. (April 11, 2005). "Chessboard Tasks". Math Games. Mathematical Association of America. Retrieved June 25, 2012.
The Weekly Dispatch, April 29 and May 13, 1900, as cited by Knuth 2008. Knuth, Donald E. (2008). "Answer to exercise 242". The Art of Computer Programming, Fascicle 1b: A Draft of Section 7.1.4: Binary Decision Diagrams. p. 130.