A375853
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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A375853: Triangle read by rows: T(n, k) = k*(n - k)*binomial(2*n+2, 2*k+1)/(4*n + 2) for 1 <= k <= n-1.
(identification, match reversed triangle, match triangle)
2 · 8, 8 · 20, 56, 20 · 40, 216, 216, 40 … row sums 2, 16, 96, 512, 2560, 12288, 57344, …