A075506
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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Triangle read by rows: Stirling2 triangle with scaled diagonals (powers of 7).
(match row sums)
49, 21, 1 · 343, 343, 42, 1 · 2401, 5145, 1225, 70, 1 … row sums 71, 729, 8842, 125399, 2026249, …