A111049
Sequences linked to this entry ?
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A111049: Triangle T(n,k), 0 <= k <= n, read by rows, given by [1, 0, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, ...] DELTA [1, 1, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, ...] w…
identification, match triangle
1 · 1, 1 · 1, 3, 2 · 1, 6, 9, 4 … Σ 1, 2, 6, 20, 72, 272, 1056, 4160, …