A257616
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.
-
A257616: Triangle read by rows: T(n,k) = t(n-k, k); t(n,m) = f(m)*t(n-1,m) + f(n)*t(n,m-1), where f(x) = 6*x + 2.
(identification, match reversed triangle, match triangle)
1 · 2, 2 · 4, 32, 4 · 8, 312, 312, 8 … row sums 1, 4, 40, 640, 14080, 394240, 13404160, …