A272867
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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A272867: Triangle read by rows, T(n,k) = GegenbauerC(m,-n,-2) where m = k if k<n else 2*n-k, for n>=0 and 0<=k<=2n.
(identification, match reversed triangle, match triangle)
1 · 1, 4, 1 · 1, 8, 18, 8, 1 … row sums 1, 6, 36, 216, 1296, 7776, 46656, …