A124038
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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A124038: Triangle read by rows: T(n, k) = T(n-1, k-1) - T(n-2, k), with T(n, n) = 1, T(n, n-1) = -2.
(identification, match triangle)
1 · -2, 1 · -1, -2, 1 · 2, -2, -2, 1 … row sums 1, -1, -2, -1, 1, 2, 1, -1, …