A005430
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.
-
A367270 → D
(match row sums)
2 · 6, 6 · 12, 36, 12 · 20, 120, 120, 20 … row sums 0, 0, 2, 12, 60, 280, 1260, 5544, …