A330381

Sequences linked to this entry ?

• A330381: Triangle read by rows: T(n,k) is the number of ternary strings of length n with k indispensable digits, with 0 <= k <= n. identification, match triangle
  1 · 1, 2 · 1, 5, 3 · 1, 9, 13, 4 … Σ 1, 3, 9, 27, 81, 243, 729, 2187, …
  (−∞, 0)nonnegative
• A104029: Triangle, read by rows, of pairwise sums of trinomial coefficients (A027907). match reversed triangle
  1 · 2, 1 · 3, 5, 1 · 4, 13, 9, 1 … Σ 1, 3, 9, 27, 81, 243, 729, 2187, …
  (−∞, 0)nonnegative