Given a number n, return an array containing several arrays. Each array increments in size, from range 1 to n inclusive, contaning its length as the elements.

Examples

pyramid_arrays(1) ➞ [[1]]

pyramid_arrays(3) ➞ [[1], [2, 2], [3, 3, 3]]

pyramid_arrays(5) ➞ [[1], [2, 2], [3, 3, 3], [4, 4, 4, 4], [5, 5, 5, 5, 5]]

Notes

n will be a positive integer.