A100861
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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A100861: Triangle of Bessel numbers read by rows: T(n,k) is the number of k-matchings of the complete graph K(n).
(identification, match triangle)
1 · 1 · 1, 1 · 1, 3 … row sums 1, 1, 2, 4, 10, 26, 76, 232, …
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A122848: Exponential Riordan array (1, x(1+x/2)).
(match reversed triangle)
A100861 → reverse1 · 0, 1 · 0, 1, 1 · 0, 0, 3, 1 … row sums 1, 1, 2, 4, 10, 26, 76, 232, …