A050152
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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A126216 → D
(match row sums)
1 · 5, 2 · 21, 18, 3 · 84, 112, 42, 4 … row sums 0, 1, 7, 42, 242, 1375, 7773, 43876, …