A053120
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
(match triangle)
1 · 0, 1 · -1, 0, 2 · 0, -3, 0, 4 … row sums 1, 1, 1, 1, 1, 1, 1, 1, …