once in a lower (subscript) position
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The rule in this case is that there are no numbers in any position.
a maths solution
22 - 3n
4n+5
1 2 3 4 5 2 5 8 11 14 ... If this is the sequence, the position-to-term rule is 3n-1. However, it could be another sequence depending on the rest of the terms.