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A129788
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Ceiling(4^n/n).
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1
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4, 8, 22, 64, 205, 683, 2341, 8192, 29128, 104858, 381301, 1398102, 5162221, 19173962, 71582789, 268435456, 1010580541, 3817748708, 14467258261, 54975581389, 209430786244, 799644820201, 3059510616421, 11728124029611
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