A257623
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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A257623: Triangle read by rows: T(n,k) = t(n-k, k), where t(n,m) = f(m)*t(n-1,m) + f(n)*t(n,m-1) and f(n) = 5*n + 3.
(identification, match reversed triangle, match triangle)
1 · 3, 3 · 9, 48, 9 · 27, 501, 501, 27 … row sums 1, 6, 66, 1056, 22176, 576576, …