A015535
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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A121574 → x ↦ x/(x+1)
(match row sums)
1 · 2, 3 · 4, 13, 10 · 8, 40, 64, 33 … row sums 1, 5, 27, 145, 779, 4185, 22483, …