A237420
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 → D → Veronese 2 (j=1)
(match row sums)
2 · 0, 4 · 0, 0, 6 · 0, 0, 0, 8 … row sums 0, 0, 2, 0, 4, 0, 6, 0, …