Octagons in Dominoes

The following pictures show n unit octagons packed inside the smallest known domino (with short side s).

1-2.

s = 1 + √2 = 2.41421+
Trivial.
  		           3.

s = 3.51367+
Found by Jonathan Viquerat
in May 2026. 		           4.

s = 3.97990+
Found by Jonathan Viquerat
in May 2026.

5.

s = 4.28798+
Found by Jonathan Viquerat
in May 2026. 		           6.

s = 4.50805+
Found by Jonathan Viquerat
in May 2026. 		           7.-8.

s = 2 + 2√2 = 4.82842+
Trivial.
 
9.

s = 5.49509+
Found by Jonathan Viquerat
in May 2026. 		           10.

s = 3 + 2√2 = 5.82842+
Found by Jonathan Viquerat
in May 2026. 		           11.

s = 6.02842+
Found by Jonathan Viquerat
in May 2026.
12.

s = 6.31126+
Found by Jonathan Viquerat
in May 2026. 		           13.-14.

s = 6.51126+
Found by Jonathan Viquerat
in May 2026. 		           15.

s = 6.77016+
Found by Jonathan Viquerat
in May 2026.
16.

s = 7.10456+
Found by Jonathan Viquerat
in May 2026. 		           17.-18.

s = 3 + 3√2 = 7.24263+
Trivial.
  		           19.

s = 7.77123+
Found by Jonathan Viquerat
in May 2026.
20.

s = 8.03947+
Found by Jonathan Viquerat
in May 2026.