A201637
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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A201637: Triangle of second-order Eulerian numbers T(n,k) (n>=0, 0 <= k <= n) read by rows.
(identification)
1 · 1 · 1, 2 · 1, 8, 6 … row sums 1, 1, 3, 15, 105, 945, 10395, 135135, …
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A288874: Row reversed version of triangle A201637 (second-order Eulerian triangle).
(match reversed triangle)
A201637 → reverse (shift +1)1 · 0, 1 · 0, 2, 1 · 0, 6, 8, 1 … row sums 1, 1, 3, 15, 105, 945, 10395, 135135, …