Pyramid Puzzle

In a certain kind of pyramid, each number in a row is the sum of the two numbers directly above it (arranged in a triangular fashion).

Given an integer n, return the first of the n rows of the pyramid.

For example, if n = 5, then the first 5 rows of the pyramid will be represented in the array form as follows,

[[1], [1, 1], [1, 2, 1], [1, 3, 3, 1], [1, 4, 6, 4, 1]]

Constraints

• 1 <= n <= 30