It's easier to count the blocks in columns. 10 of the columns do not have rabbit blocks. The 5th and 11th columns have two rabbit blocks and the 19th has three of them. I have counted from the bottom of each column. RB means rabbit block. There is little variation in the total number of blocks in each column.

1. 5 RB 13. 18 + 1 = 19

2. 20

3. 9 RB 8. 17 + 1 = 18

4. 21

5. 1 RB 14 RB 6. 21 + 2 = 23

6. 18

7. 5 RB 14. 19 + 1 = 20

8. 18

9. 19 RB. 19 + 1 = 20

10. 19

11. 8 RB 1 RB 7. 16 + 2 = 18

12. 21

13. 19

14. 6 RB 14. 20 + 1 = 21

15. RB 20. 20 + 1 = 21

16. 15 RB 5. 20 + 1 = 21

17. 16

18. 13 RB 2. 15 + 1 = 16

19. 6 RB 13. 19 + 1 = 20

20. 1 RB 13 RB 6 RB. 20 + 3 = 23

21. 20

22. 18

23. 2 RB 17. 19 + 1 = 20

24. 16 RB 1. 17 + 1 = 18

25. RB 18. 18 + 1 = 19

I hoped there might be some pattern in the numbers. Substituting letters for numbers gave nonsense.

Counting blocks between rabbits didn't show me anything.

I thought about counting just the blocks under a rabbit block - as if the rabbit were sitting on the blocks (counting sideways if that block was sideways), but there is a rabbit block at the bottom of the 15th column which has no blocks under it. Similarly for counting blocks above a rabbit block in the direction of the ears there is a rabbit block at the top of the 20th column.

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