13. Four small animals are changing seats. At first, the mouse sits in seat No. 1, the monkey in seat No. 2, the rabbit in seat No. 3, and the cat in seat No. 4. Then they keep swapping seats. The first time, the top and bottom rows swap. The second time, after the first swap, the left and right rows swap. The third time, the top and bottom rows swap again. The fourth time, the left and right rows swap again... This continues. Ask: After the tenth seat swap, which seat number is the rabbit sitting in? (Refer to the diagram below)
After the tenth seat change, Little Rabbit is sitting in seat number 2.
13.【Solution】According to the problem, we need to find the pattern of Little Rabbit's seat changes.

It can be observed: every time the seats are changed, Little Rabbit's seat moves one position clockwise. After every 4 seat changes, Little Rabbit's seat returns to its original position. Knowing this pattern, the answer is not difficult to obtain. After the tenth seat change, Little Rabbit's seat should be in seat number 2.

Answer: After the tenth seat change, Little Rabbit is sitting in seat number 2.