A003581
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.
-
Triangle T(n,k) read by rows: T(n, k) = (m*n - m*k + 1)*T(n - 1, k - 1) + (9*k - 8)*(m*k - (m - 1))*T(n - 1, k) where m = 0.
(match row sums)
1, 11, 1 · 1, 111, 30, 1 · 1, 1111, 681, 58, 1 … row sums 13, 143, 1852, 27563, 473725, 9290396, …