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A085010
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a(n)=2^(2^n)*sum(k=0,n,1/2^(2^k)).
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0
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1, 3, 13, 209, 53505, 3506503681, 15060318633198616577, 277813843495134114797235287762174738433, 94535152227927400227782074307303551040545228366095741656402842333161034088449
(list; graph; refs; listen; history; internal format)
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