A108981
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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A249250 → x ↦ x/(x+1)
(match row sums)
1 · 1, 4 · 1, 8, 10 · 1, 12, 36, 28 … row sums 1, 5, 19, 77, 307, 1229, 4915, 19661, …