A282629
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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A282629: Sheffer triangle (exp(x), exp(3*x) - 1). Named S2[3,1].
(identification, match triangle)
1 · 1, 3 · 1, 15, 9 · 1, 63, 108, 27 … row sums 1, 4, 25, 199, 1876, 20257, 245017, …