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A072639
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a(0) = 0, a(n) = sum_{i=0}^{n-1} 2^((2^i)-1).
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5
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0, 1, 3, 11, 139, 32907, 2147516555, 9223372039002292363, 170141183460469231740910675754886398091, 57896044618658097711785492504343953926805133516280751251469702679711451218059
(list; graph; refs; listen; history; internal format)
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