edaBit-coding-challenges/Stack-the-Boxes

Stack the Boxes

by Matt tags: math, numbers, algebra

Summary

Here's an image of four models. Some of the cubes are hidden behind other cubes. Model one consists of one cube. Model two consists of four cubes, and so on... Stack the Boxes Write a function that takes a number n and returns the number of stacked boxes in a model n levels high, visible and invisible. Examples stackBoxes(1) ➞ 1 stackBoxes(2) ➞ 4 stackBox

Instructions

Here's an image of four models. Some of the cubes are hidden behind other cubes. Model one consists of one cube. Model two consists of four cubes, and so on...

Write a function that takes a number n and returns the number of stacked boxes in a model n levels high, visible and invisible.

Examples

stackBoxes(1) ➞ 1

stackBoxes(2) ➞ 4

stackBoxes(0) ➞ 0

Notes

Step n is a positive integer.