Fizz Buzz but it unnecessarily uses OOP

fizz-buzz-but-oop.py

class FizzBuzz(object):
    def __init__(self, n):
        self.size = n
        # Define a dictionary containing the fizz buzzes
        self.d = {3: "Fizz",
                 5: "Buzz"}
        
    def get_fizzbuzz_sequence(self):
        ls = []
        for i in range(1, self.size + 1):
            output = ""
            for num in self.d:
                if i % num == 0:
                    output += self.d[num]
                
            if output == "":
                output = i
            
            ls.append(output)
                    
        return ls



def fizz_buzz(num):
    fb = FizzBuzz(num)
    return fb.get_fizzbuzz_sequence()