How many triangles will there be after n number of sequences?

How many triangles will there be after n number of sequences?
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Answer :

I drew two more iterations of the pattern and added 9, then 12 more triangles. Your first two drawings showed 3 then 6. So the first 4 iterations go 3, 6, 9, 12… if that continues, it seems the pattern is adding 3n each time. But you’re asking what the total number of triangles is after n iterations? So then the first four iterations are 4, 10, 19, 31… and you’ll have to give me a moment to come up with the formula for that sequence.
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