A190981
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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A207823 → x ↦ x/(x+1)
(match row sums)
1 · 4, 5 · 15, 38, 24 · 56, 214, 272, 115 … row sums 1, 9, 77, 657, 5605, 47817, 407933, …