A209414
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A209414: Triangle of coefficients of polynomials u(n,x) jointly generated with A112351; see the Formula section.
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1 · 1, 1 · 1, 4, 1 · 1, 7, 9, 1 … Σ 1, 2, 6, 18, 54, 162, 486, 1458, …