Level
pending

How many distinct equilateral triangles can we count in the diagram below such that

- every vertex of the triangle is a vertex on the diagram, and
- the triangle is oriented in the same direction as triangle \(ABC?\)

**Bonus and Details:**

- What's the general formula for the corresponding question with the diagram having \(n\) rows in the triangular grid?
- This is not an original question from me.

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