A330510
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A330510: Triangle read by rows: T(n,k) is the number of ternary strings of length n+1 with k+1 indispensable digits and a nonzero leading digit, with 0 <= k <=…
identification, match reversed triangle, match triangle
2 · 3, 3 · 4, 10, 4 · 5, 22, 22, 5 … Σ 2, 6, 18, 54, 162, 486, 1458, 4374, …