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A093638
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G.f.: A(x) = Product_{n>=0} 1/(1-a(n)*x^(n+1))^2 = Sum_{n>=0} a(n)*x^n.
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3
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1, 2, 7, 26, 109, 466, 2142, 9870, 47438, 228750, 1133373, 5618252, 28431660, 143809690, 738803296, 3794224624, 19718366257, 102416655624, 537315418006, 2816334685644, 14883569577907, 78603101910486, 417974689553235
(list; graph; refs; listen; history; internal format)
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