Programming Maths References https://www.youtube.com/watch?v=17WoOqgXsRM&list=PLRqwX-V7Uu6ZiZxtDDRCi6uhfTH4FilpH&ab_channel=TheCodingTrain https://www.ms.uky.edu/~droyster/ma114F16/RecursiveSequences.pdf
