This page contains a gallery of symmetric forms, that you can make of bridged Triamonds. I would like to find all triangle-mirror symmetric forms with solutions because of my addiction to systematic approaches, but this is maybe later. The following forms are currently only a selection.
9 * 6 solutions

12 * 6 solutions

no solution

7 * 6 solutions

7 * 6 solutions

1147 * 6 solutions

911 * 6 solutions

23 * 6 solutions

61 * 6 solutions

64 * 6 solutions

99 * 6 solutions

204 * 6 solutions

29 * 6 solutions

8 * 6 solutions

5 * 6 solutions

2 * 6 solutions

15 * 6 solutions

11 * 6 solutions

1 * 6 solutions

no solution

4 * 3 solutions

2 * 3 solutions

6 * 3 solutions

40 * 3 solutions

7 * 3 solutions

5 * 3 solutions

3 * 3 solutions

2 * 3 solutions

1662 * 2 solutions

45 * 2 solutions

8 * 2 solutions

169 * 2 solutions

68 * 2 solutions

93 * 2 solutions

31 * 2 solutions

152 * 2 solutions

79 * 2 solutions

67 * 2 solutions

20 * 3 solutions

157 * 2 solutions
