A274498
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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A274498: Triangle read by rows: T(n,k) is the number of ternary words of length n having degree of asymmetry equal to k (n>=0; 0<=k<=n/2).
(identification, match triangle)
1 · 3 · 3, 6 · 9, 18 … row sums 1, 3, 9, 27, 81, 243, 729, 2187, …