A006191
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 → Veronese 2
(match row sums)
1 · 2 · 4, 1 · 8, 8 … row sums 1, 2, 5, 16, 54, 180, 595, 1964, …