A008971
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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A008971: Triangle read by rows: T(n,k) is the number of permutations of [n] with k increasing runs of length at least 2.
(identification, match triangle)
type_b_eulerian → γ (scale 1/4)1 · 1 · 1, 1 · 1, 5 … row sums 1, 1, 2, 6, 24, 120, 720, 5040, …