Grokking Dynamic Programming Patterns for Coding Interviews
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Solution: Number factors
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Problem Statement

Given a number 'n', implement a method to count how many possible ways there are to express 'n' as the sum of 1, 3, or 4.

Example 1:

n : 4
Number of ways = 4
Explanation: Following are the four ways we can express 'n' : {1,1,1,1}, {1,3}, {3,1}, {4}

Example 2:

n : 5
Number of ways = 6
Explanation: Following are the six ways we can express 'n' : {1,1,1,1,1}, {1,1,3}, {1,3,1}, {3,1,1}, 
{1,4}, {4,1}

Let's first start with a recursive brute-force solution.

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