A002740
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.
-
A132812 → D
(match row sums)
2 · 9, 6 · 24, 48, 12 · 50, 200, 150, 20 … row sums 0, 2, 15, 84, 420, 1980, 9009, 40040, …