A020727

Sequences linked to this entry ?

• A181289: Triangle read by rows: T(n,k) is the number of 2-compositions of n having length k (0 <= k <= n). match row sums
  1 · 0, 2 · 0, 3, 4 · 0, 4, 12, 8 … Σ 1, 2, 7, 24, 82, 280, 956, 3264, …
  [−1, ∞)nonnegative