A003688
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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A116412: Riordan array ((1+x)/(1-2x),x(1+x)/(1-2x)).
(match row sums)
1 · 3, 1 · 6, 6, 1 · 12, 21, 9, 1 … row sums 1, 4, 13, 43, 142, 469, 1549, 5116, …
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A249251: Triangular array: row n gives the coefficients of the polynomial p(n,x) defined in Comments.
(match row sums)
1 · 1, 3 · 1, 6, 6 · 1, 9, 21, 12 … row sums 1, 4, 13, 43, 142, 469, 1549, 5116, …