a(n) = a(floor(n/2)) + floor(n/2) with a(1) = 1. 1, 2, 2, 4, 4, 5, 5, 8, 8, 9, 9, 11, 11, 12, 12, 16, 16, 17, 17, 19, 19, 20, 20, 23, 23, 24
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