A274499
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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A274498 → D
(match row sums)
6 · 18 · 36, 72 · 108, 216 … row sums 0, 0, 6, 18, 108, 324, 1458, 4374, …