A014601
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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A023531 → 2D+1+2n → Veronese 2 (j=1)
(match row sums)
3 · 4 · 0, 7 · 0, 8 … row sums 0, 3, 4, 7, 8, 11, 12, 15, …