A200536
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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A200536: Triangle, read by rows of 2*n+1 terms, where row n lists the coefficients in (1+3*x+2*x^2)^n.
(identification, match triangle)
1 · 1, 3, 2 · 1, 6, 13, 12, 4 … row sums 1, 6, 36, 216, 1296, 7776, 46656, …