A111006
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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A026729 → x ↦ x/(x+1)
(match triangle)
1 · 0, 1 · 0, 1, 2 · 0, 0, 2, 3 … row sums 1, 1, 3, 5, 11, 21, 43, 85, …