A152828
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.
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A152828: Triangle read by rows, A007318 rows repeated three times.
(identification, match reversed triangle, match triangle)
1 · 1 · 1 · 1, 1 … row sums 1, 1, 1, 2, 2, 2, 4, 4, …