I think you're approaching the problem from an array offset point of view (start at 0) where 0 should return the input with no transformations applied. Likewise, 2 would give the result after two iterations.
The problem statement is approaching it from an ordinal perspective. In their view, 1 should be the un-mutated input.
I think they tried to call this out by noting "1": ["1", "11", "21, "1211", "111221", ...], but I agree that it isn't very clear from the text alone.
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I think you're approaching the problem from an array offset point of view (start at 0) where 0 should return the input with no transformations applied. Likewise, 2 would give the result after two iterations.
The problem statement is approaching it from an ordinal perspective. In their view, 1 should be the un-mutated input.
I think they tried to call this out by noting
"1": ["1", "11", "21, "1211", "111221", ...], but I agree that it isn't very clear from the text alone.