Strategies to Think | Math Olympiad | Counting Traingles, Noticing Patterns and Recursion

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We can create an explicit formula for the recursive relation.
I have derived the same to be : 4^n for the nth step
Therefore, the number of closed regions/small triangles in the 20th step =
4^20 = 10, 99, 51, 16, 27, 776 or 1, 099, 511, 627, 776

RaghavMukhija
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Step 20 in the Indian System of Numeration- 10, 99, 51, 16, 27, 776
International System of Numeration- 1, 099, 511, 627, 776

priyankabhattacharya
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10, 99, 51, 16, 27, 776
Will be the 20th step.

shomaissar