A006659
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.
-
A108838 → D
(match row sums)
2 · 8, 4 · 20, 30, 6 · 40, 120, 72, 8 … row sums 0, 2, 12, 56, 240, 990, 4004, 16016, …