Find a sequence of natural numbers $a_i$ such that $a_i = \displaystyle\sum_{r=1}^{i+4} d_r$, where $d_r \neq d_s$ for $r \neq s$ and $d_r$ divides $a_i$.
To find a sequence of natural numbers \( a_i \) such that \( a_i = \sum_{r=1}^{i+4} d_r \), where \( d_r \neq d_s \) for \( r \neq s \) and \( d_r \) divides \( a_i \), we need to construct \( a_i \) and \( d_r \) satisfying these conditions.

1. **Identify the sequence structure**:
   - We need \( a_i \) to be the sum of \( i+4 \) distinct divisors \( d_r \) of \( a_i \).

2. **Choose a simple sequence for \( a_i \)**:
   - Let's start with \( a_i = k(i+4) \) for some integer \( k \). This ensures that \( a_i \) has at least \( i+4 \) divisors.

3. **Select distinct divisors \( d_r \)**:
   - For simplicity, choose \( k = 1 \). Then \( a_i = i+4 \).
   - The divisors of \( a_i \) (which is \( i+4 \)) must be distinct and sum to \( a_i \).

4. **Verify the divisors**:
   - For \( i = 1 \), \( a_1 = 1+4 = 5 \). The divisors of 5 are 1 and 5. However, we need 5 divisors.
   - For \( i = 2 \), \( a_2 = 2+4 = 6 \). The divisors of 6 are 1, 2, 3, and 6. We need 6 divisors.
   - For \( i = 3 \), \( a_3 = 3+4 = 7 \). The divisors of 7 are 1 and 7. We need 7 divisors.
   - For \( i = 4 \), \( a_4 = 4+4 = 8 \). The divisors of 8 are 1, 2, 4, and 8. We need 8 divisors.

5. **Adjust the approach**:
   - Let's try \( a_i = (i+4)! \). This factorial ensures a large number of divisors.
   - For \( i = 1 \), \( a_1 = 5! = 120 \). The divisors of 120 include 1, 2, 3, 4, 5, 6, 8, 10, 12, 15, 20, 24, 30, 40, 60, and 120. We can choose 5 distinct divisors that sum to 120.
   - For \( i = 2 \), \( a_2 = 6! = 720 \). The divisors of 720 include 1, 2, 3, 4, 5, 6, 8, 9, 10, 12, 15, 16, 18, 20, 24, 30, 36, 40, 45, 48, 60, 72, 80, 90, 120, 144, 180, 240, 360, and 720. We can choose 6 distinct divisors that sum to 720.
   - For \( i = 3 \), \( a_3 = 7! = 5040 \). The divisors of 5040 include 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 12, 14, 15, 16, 18, 20, 21, 24, 28, 30, 35, 36, 40, 42, 45, 48, 56, 60, 63, 70, 72, 80, 84, 90, 105, 112, 120, 126, 140, 144, 168, 180, 210, 240, 252, 280, 315, 336, 360, 420, 504, 560, 630, 720, 840, 1008, 1260, 1680, 2520, and 5040. We can choose 7 distinct divisors that sum to 5040.

6. **Generalize the sequence**:
   - For any \( i \), \( a_i = (i+4)! \) will have enough divisors to choose \( i+4 \) distinct divisors that sum to \( a_i \).

Conclusion:
The sequence \( a_i = (i+4)! \) satisfies the given conditions.

The final answer is \( \boxed{ a_i = (i+4)! } \)