A135089
Sequences linked to this entry ?
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A135089: Triangle T(n,k) = 5*binomial(n,k) with T(0,0) = 1, read by rows.
identification, match reversed triangle, match triangle
1 · 5, 5 · 5, 10, 5 · 5, 15, 15, 5 … Σ 1, 10, 20, 40, 80, 160, 320, 640, …