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

A119921

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

Terms

    a(0) =2a(1) =12a(2) =72a(3) =336a(4) =1632a(5) =6720a(6) =29568a(7) =120576a(8) =499200a(9) =2012160a(10) =8214528a(11) =32894976a(12) =132882432a(13) =532070400a(14) =2136637440a(15) =8551464960a(16) =34282536960a(17) =137135652864a(18) =549148164096

External references