A281199
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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A172431 → D
(match row sums)
2 · 4, 6 · 6, 20, 12 · 8, 42, 60, 20 … row sums 0, 2, 10, 38, 130, 420, 1308, 3970, …