A327997
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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A327997: Triangle read by rows: coefficients of the polynomials given by KummerU(-n, 1 - n - x, 3).
(identification, match triangle)
1 · 3, 1 · 9, 7, 1 · 27, 38, 12, 1 … row sums 1, 4, 17, 78, 393, 2208, 13977, 100026, …