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Thought A at first was calculated by a sum of all previous values in A, not the previous row only. Once I understood that distinction was able to find the solution!
Sometimes we use Alteryx to simplify math.
Other times we do it the opposite way.
Noting that column A is the Fibonacci sequence and applying some series addition we can see that B and C are the n-2th and n-3th terms of same.
Knowing that, we can calculate A directly and B and C from A.
We could go a step further and code a single number that is A*10^12+B*10^6+C and get it done in a single multi-row formula but the coding and decoding would use more tools that we would save on formulas.
