Dominoes in Dominoes

The following pictures show n dominoes (with short side 1) packed inside the smallest known domino (with short side length s).

1.

s = 1
Trivial. 		           2.

s = (2+√2)/√3 = 1.971+
Found by Erich Friedman in April 2026. 		           3.-4.

s = 2
Trivial.

5.

s = 5/2 = 2.5
Trivial. 		           6.

s = 2.916+
Found by Erich Friedman in April 2026. 		           7.-9.

s = 3
Trivial.
10.

s = 7/2 = 3.5
Trivial. 		           11.

s = (5+√41)/3 = 3.801+
Found by Maurizio Morandi in April 2026. 		           12.

s = 5/2+√2 = 3.914+
Found by Maurizio Morandi in April 2026.
14.-16.

s = 4
Trivial. 		           17.-18.

s = 9/2 = 4.5
Trivial. 		           19.

s = 3(5+√2)/4 = 4.81066+
Found by Maurizio Morandi in June 2026.
20.

s = 4.95714+
Found by Maurizio Morandi in June 2026. 		           21.-25.

s = 5
Trivial.