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A099050
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a(1)=1; for n>=2, a(n)=sum(1<=i<=j<=n-1, gcd(a(i),a(j))).
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0
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1, 1, 3, 8, 19, 42, 92, 194, 398, 808, 1638, 3334, 6686, 13392, 26842, 53708, 107450, 214952, 430148, 860340, 1720826, 3441688, 6883446, 13766950, 27533998, 55068040, 110136196, 220272460, 440545040, 881090532, 1762181454, 3524362990
(list; graph; refs; listen; history; internal format)
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