A207606
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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A207606: Triangle of coefficients of polynomials u(n,x) jointly generated with A207607; see the Formula section.
(identification)
4, 7, 2 · 5, 16, 11, 2 · 6, 30, 36, 15, 2 … row sums 13, 34, 89, 233, 610, 1597, 4181, …