A005809

Sequences linked to this entry ?

• Number triangle T(n,k) = binomial(n,k)*binomial(2n,n-k). match row sums
  6, 8, 1 · 20, 45, 18, 1 · 70, 224, 168, 32, 1 … Σ 15, 84, 495, 3003, 18564, 116280, …
  (−∞, 0)nonnegative