This paper, "Programming by Numbers: A Programming Method for Novices", presents a recipe of how to design recursive functions: https://eprints.soton.ac.uk/254

This paper, "Programming by Numbers: A Programming Method for Novices", presents a recipe of how to design recursive functions: https://eprints.soton.ac.uk/254242/1/p_by_numbers.pdf https://eprints.soton.ac.uk/254242/1/p_by_numbers.pdf And the "The Little Schemer" book has a series of exercises that expose recursive thinking: https://www.amazon.com/Little-Schemer-Daniel-P-Friedman/dp/0262560992 https://www.amazon.com/Little-Schemer-Daniel-P-Friedman/dp/0... Hope this helps!