A039991

View A039991 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.

• A039991: Triangle of coefficients of cos(x)^n in polynomial for cos(nx). (identification)
  1 · 1 · 2, 0, -1 · 4, 0, -3 … row sums 1, 1, 1, 1, 1, 1, 1, 1, …
  A039991 (−∞, ∞)
• chebyshev_t (match reversed triangle)
  1 · 0, 1 · -1, 0, 2 · 0, -3, 0, 4 … row sums 1, 1, 1, 1, 1, 1, 1, 1, …
  (−1, 1)