A135838
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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A135838: Triangle read by rows: T(n,k) = 2^floor(n/2)*binomial(n-1,k-1).
(identification, match reversed triangle, match triangle)
1 · 2, 2 · 2, 4, 2 · 4, 12, 12, 4 … row sums 1, 4, 8, 32, 64, 256, 512, 2048, …