Number of 2n-bead balanced binary strings of fundamental period 2n, rotationally equivalent to reversed complement.

A045664

Number of 2n-bead balanced binary strings of fundamental period 2n, rotationally equivalent to reversed complement.

Terms

    a(0) =1a(1) =2a(2) =4a(3) =18a(4) =48a(5) =150a(6) =324a(7) =882a(8) =1920a(9) =4536a(10) =9900a(11) =22506a(12) =48240a(13) =106470a(14) =227556a(15) =490950a(16) =1044480a(17) =2228190a(18) =4708368a(19) =9961434a(20) =20950800a(21) =44037378a(22) =92229588a(23) =192937938a(24) =402549120a(25) =838860000a(26) =1744617420a(27) =3623864832a(28) =7515733680

External references