A136521
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A136521: Triangle read by rows: (1, 2, 2, 2, ...) on the main diagonal and the rest zeros.
identification, match triangle
1 · 0, 2 · 0, 0, 2 · 0, 0, 0, 2 … Σ 1, 2, 2, 2, 2, 2, 2, 2, …
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