A257622
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.
-
A257622: 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) = 3*x + 4.
(identification, match reversed triangle, match triangle)
1 · 4, 4 · 16, 56, 16 · 64, 552, 552, 64 … row sums 1, 8, 88, 1232, 20944, 418880, 9634240, …