A028326
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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A028326: Twice Pascal's triangle A007318: T(n,k) = 2*C(n,k).
(identification, match reversed triangle, match triangle)
2 · 2, 2 · 2, 4, 2 · 2, 6, 6, 2 … row sums 2, 4, 8, 16, 32, 64, 128, 256, …