A001871
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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A078812 → D
(match row sums)
1 · 4, 2 · 10, 12, 3 · 20, 42, 24, 4 … row sums 0, 1, 6, 25, 90, 300, 954, 2939, …