There is a list of $n$ football matches. Determine how many possible columns, with an even number of draws, there are.
1. **Define the problem in terms of sequences:**
   We need to find the number of sequences of length \( n \) from the alphabet \(\{a, b, c\}\) that contain an even number of \( a \)'s.

2. **Establish the recurrence relation:**
   Let \( a_n \) be the number of sequences of length \( n \) with an even number of \( a \)'s. We can derive a recurrence relation for \( a_n \) by considering the last character of the sequence:
   - If the last character is \( b \) or \( c \), the number of sequences of length \( n \) with an even number of \( a \)'s is the same as the number of sequences of length \( n-1 \) with an even number of \( a \)'s. This is because adding \( b \) or \( c \) does not change the parity of the number of \( a \)'s.
   - If the last character is \( a \), the number of sequences of length \( n \) with an even number of \( a \)'s is the same as the number of sequences of length \( n-1 \) with an odd number of \( a \)'s. This is because adding \( a \) changes the parity of the number of \( a \)'s.

   Let \( b_n \) be the number of sequences of length \( n \) with an odd number of \( a \)'s. Then we have:
   \[
   a_n = 2a_{n-1} + b_{n-1}
   \]
   \[
   b_n = 2b_{n-1} + a_{n-1}
   \]

3. **Initial conditions:**
   For \( n = 0 \), there is exactly one sequence (the empty sequence) with an even number of \( a \)'s and zero sequences with an odd number of \( a \)'s:
   \[
   a_0 = 1, \quad b_0 = 0
   \]

4. **Solve the recurrence relation:**
   We can solve the recurrence relation by iterating from the initial conditions:
   \[
   \begin{aligned}
   a_1 &= 2a_0 + b_0 = 2 \cdot 1 + 0 = 2 \\
   b_1 &= 2b_0 + a_0 = 2 \cdot 0 + 1 = 1 \\
   a_2 &= 2a_1 + b_1 = 2 \cdot 2 + 1 = 5 \\
   b_2 &= 2b_1 + a_1 = 2 \cdot 1 + 2 = 4 \\
   a_3 &= 2a_2 + b_2 = 2 \cdot 5 + 4 = 14 \\
   b_3 &= 2b_2 + a_2 = 2 \cdot 4 + 5 = 13 \\
   \end{aligned}
   \]

   We can continue this process to find \( a_n \) for any \( n \).

5. **General solution:**
   The recurrence relation can also be solved using characteristic equations, but for simplicity, we can use the iterative method to find the number of sequences for specific values of \( n \).

The final answer is \( \boxed{ a_n } \).