A013708
identification: the entry's rule defines the sequence for every index; tail: the sequence is the entry's tail after some prefix rows; match_*: finite agreement only.
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A120909 → basis A013610
(match row sums)
3 · 9, 18 · 27, 108, 108 · 81, 486, 972, 648 … row sums 3, 27, 243, 2187, 19683, 177147, …