a(n) = ceiling( n * (log_3 2)) = ceiling(n * 0.6309297535714574371...). 0, 1, 2, 2, 3, 4, 4, 5, 6, 6, 7, 7, 8, 9, 9, 10, 11, 11, 12, 12, 13, 14, 14, 15, 16, 16, 17, 18
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