A106246

View A106246 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.

• A106246: Number triangle T(n,k)=C(n,k)C(2,n-k). (identification, match triangle)
  A023531 → (1/2)D²+2D+1
  1 · 2, 1 · 1, 4, 1 · 0, 3, 6, 1 … row sums 1, 3, 6, 10, 15, 21, 28, 36, …
  A106246 (−∞, 0] nonnegative