The following pictures show n dominoes (with short side 1) packed inside the smallest known pentagons (with side s).
1. 
s = 1.53575+
Trivial.
2. 
s = 1.86167+
Found by Jonathan Viquerat
in May 2026.
3. 
s = 2.31933+
Found by Jonathan Viquerat
in May 2026.
4. 
s = 2.58859+
Found by Jonathan Viquerat
in May 2026.
5. 
s = 2.80725+
Found by Jonathan Viquerat
in May 2026.
6. 
s = 2.98883+
Found by Jonathan Viquerat
in May 2026.
7. 
s = 3.24589+
Found by Jonathan Viquerat
in May 2026.
8. 
s = 3.49269+
Found by Jonathan Viquerat
in May 2026.
9. 
s = 3.65963+
Found by Jonathan Viquerat
in May 2026.
10. 
s = 3.82264+
Found by Jonathan Viquerat
in May 2026.
11. 
s = 3.94761+
Found by Jonathan Viquerat
in May 2026.
12. 
s = 4.15223+
Found by Jonathan Viquerat
in May 2026.
13. 
s = 4.26767+
Found by Jonathan Viquerat
in May 2026.
14. 
s = 4.50050+
Found by Jonathan Viquerat
in May 2026.
15. 
s = 4.61083+
Found by Jonathan Viquerat
in May 2026.
16. 
s = 4.73459+
Found by Jonathan Viquerat
in May 2026.
17. 
s = 4.84989+
Found by Jonathan Viquerat
in May 2026.
18. 
s = 4.96205+
Found by Jonathan Viquerat
in May 2026.
19. 
s = 5.17002+
Found by Jonathan Viquerat
in May 2026.
20. 
s = 5.30159+
Found by Jonathan Viquerat
in May 2026.