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def calculate_fibonacci(n):
    # Calculate Fibonacci sequence up to n numbers
    if n <= 0:
        return []
    elif n == 1:
        return [0]
    elif n == 2:
        return [0, 1]
    
    fib_sequence = [0, 1]
    for i in range(2, n):
        next_num = fib_sequence[i-1] + fib_sequence[i-2]
        fib_sequence.append(next_num)
    
    return fib_sequence

# AI Suggestions:
# 1. Add input validation for negative numbers
# 2. Consider using memoization for large n values
# 3. Add docstring for better documentation