A317496
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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A317496: Triangle T(n,k) = T(n-1,k) + 3*T(n-3,k-1) for k = 0..floor(n/3) with T(0,0) = 1, T(n,k) = 0 for n or k < 0, read by rows.
(identification, match triangle)
1 · 1 · 1 · 1, 3 … row sums 1, 1, 1, 4, 7, 10, 22, 43, …