A099250
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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A281000: Triangle read by rows: T(n,k) = binomial(2*n+1, 2*k+1)*binomial(2*n-2*k, n-k)/(n+1-k) for 0 <= k <= n.
(match row sums)
1 · 3, 1 · 10, 10, 1 · 35, 70, 21, 1 … row sums 1, 4, 21, 127, 835, 5798, 41835, …