A021012
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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A021012: Triangle of coefficients in expansion of x^n in terms of Laguerre polynomials L_n(x).
(identification, match triangle)
basis-map coefficients of A021012 → basis A1305951 · 1, -1 · 2, -4, 2 · 6, -18, 18, -6 … row sums 1, 0, 0, 0, 0, 0, 0, 0, …