A025738

View A025738 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). (match row sums)
  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
• A127773: Triangle read by rows: row n consists of n-1 zeros followed by n(n+1)/2. (match row sums)
  A010054 → reverse
  1 · 0, 3 · 0, 0, 6 · 0, 0, 0, 10 … row sums 1, 3, 6, 10, 15, 21, 28, 36, …
  A127773 [−1, 0] nonnegative rational roots
• A010054 → reverse → reverse (match row sums)
  1 · 3 · 6 · 10 … row sums 1, 3, 6, 10, 15, 21, 28, 36, …
  (−∞, 0] nonnegative rational roots
• A023531 → (1/2)D²+2D+1 → reverse (match row sums)
  1 · 1, 2 · 1, 4, 1 · 1, 6, 3 … row sums 1, 3, 6, 10, 15, 21, 28, 36, …
  (−∞, 0] nonnegative