References
- [GaS58] Gamow, G., Stern, M. (1958) Puzzle-Math. 1st Edition, Viking.
- [Knu69] DE Knuth. (1969) The Gamow-Stern Elevator Problem. Journal of Recreational Mathematics. Baywood Publishing Company, Inc. 2: 131–137.
- [Stirl] Stirling Numbers of the Second Kind. Available online at https://mathworld.wolfram.com/StirlingNumberoftheSecondKind.html.