Don Knuth's 2017 Christmas lecture featured a way to count how many ways a rectangle can be subdivided into rectangles [0]. It got its own entry in the Online E

Don Knuth's 2017 Christmas lecture featured a way to count how many ways a rectangle can be subdivided into rectangles [0]. It got its own entry in the Online Encyclopedia of Integer Sequences [1]. [0] https://youtu.be/BxQw4CdxLr8 https://youtu.be/BxQw4CdxLr8 [1] https://oeis.org/A285357 https://oeis.org/A285357