A039683

View A039683 at the OEIS

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.

• A039683: Signed double Pochhammer triangle: expansion of x(x-2)(x-4)..(x-2n+2). (identification, match triangle)
  A028338 → x ↦ −x+1
  1 · -2, 1 · 8, -6, 1 · -48, 44, -12, 1 … row sums 1, -1, 3, -15, 105, -945, 10395, …
  A039683 [1, ∞) rational roots