A211957
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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chebyshev_t → x ↦ x+1
(match triangle)
1 · 1, 1 · 1, 4, 2 · 1, 9, 12, 4 … row sums 1, 2, 7, 26, 97, 362, 1351, 5042, …