A002378
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.
-
A010054 → reverse → D
(match row sums)
2 · 0, 6 · 0, 0, 12 · 0, 0, 0, 20 … row sums 0, 0, 2, 6, 12, 20, 30, 42, …