A015021
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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A053122 → x ↦ x+1
(match row sums)
1 · -1, 1 · 0, -2, 1 · 1, 1, -3, 1 … row sums 1, 0, -1, 0, 1, 0, -1, 0, …