Number of rationals in [0, 1) having exactly n preperiodic bits, then exactly n periodic bits.

A119920

Number of rationals in [0, 1) having exactly n preperiodic bits, then exactly n periodic bits.

Terms

    a(0) =1a(1) =4a(2) =24a(3) =96a(4) =480a(5) =1728a(6) =8064a(7) =30720a(8) =129024a(9) =506880a(10) =2095104a(11) =8232960a(12) =33546240a(13) =133152768a(14) =536248320a(15) =2139095040a(16) =8589803520a(17) =34285289472a(18) =137438429184a(19) =549212651520

External references