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A102688
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a(n) = (1/n)*Sum_{k=1..n} k*2^gcd(n,k).
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0
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2, 5, 10, 20, 36, 74, 134, 272, 526, 1052, 2058, 4160, 8204, 16466, 32824, 65696, 131088, 262490, 524306, 1049168, 2097316, 4195358, 8388630, 16779632, 33554516, 67112996, 134218282, 268443848, 536870940, 1073759432, 2147483678
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