A026374
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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A026374: Triangular array T read by rows: T(n,0) = T(n,n) = 1 for all n >= 0, T(n,k) = T(n-1,k-1) + T(n-1,k) for odd n and 1< = k <= n-1, T(n,k) = T(n-1,k-1) + T(n-1,k) + T(n-2,k-1) for even n and 1 …
(identification, match reversed triangle, match triangle)
1 · 1, 1 · 1, 3, 1 · 1, 4, 4, 1 … row sums 1, 2, 5, 10, 25, 50, 125, 250, …