Compute a set of L-shaped tiles in a 2-to-the-power-n-grid (with one square missing)
This is my solution to the MIT-PUZZLE 7; reference: https://ocw.mit.edu/courses/electrical-engineering-and-computer-science/6-s095-programming-for-the-puzzled-january-iap-2018/puzzle-7-tile-that-courtyard-please/MIT6_S095IAP18_Puzzle_7.pdf