A106228
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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A172431 → ⊙ C(n,k+1) (shift -1) → reverse
(match row sums)
1 · 1, 1 · 1, 4, 1 · 1, 10, 9, 1 … row sums 1, 2, 6, 21, 80, 322, 1347, 5798, …
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A391045: Triangle read by rows: T(n,k) = binomial(n+1,k+1)*binomial(2*n-k+1,k)/(n+1), 0<=k<=n.
(match row sums)
A172431 → ⊙ C(n,k+1) (shift -1)1 · 1, 1 · 1, 4, 1 · 1, 9, 10, 1 … row sums 1, 2, 6, 21, 80, 322, 1347, 5798, …