Catalan’s Triangle
September 19, 2017
Since our exercise a week ago, I’ve been reading about Catalan numbers, primarily based on the references at OEIS. Catalan’s Triangle (A009766) is a number triangle
1 1 1 1 2 2 1 3 5 5 1 4 9 14 14 1 5 14 28 42 42 1 6 20 48 90 132 132
such that each element is equal to the one above plus the one to the left.
Your task is to write a program that calculates a Catalan triangle. When you are finished, you are welcome to read or run a suggested solution, or to post your own solution or discuss the exercise in the comments below.
Programming Praxis 