A075498
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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A075498: Stirling2 triangle with scaled diagonals (powers of 3).
(identification, match triangle)
1 · 3, 1 · 9, 9, 1 · 27, 63, 18, 1 … row sums 1, 4, 19, 109, 742, 5815, 51193, …