Number of aperiodic binary strings of length n; also number of binary sequences with primitive period n.

A027375

Number of aperiodic binary strings of length n; also number of binary sequences with primitive period n.

Terms

    a(0) =0a(1) =2a(2) =2a(3) =6a(4) =12a(5) =30a(6) =54a(7) =126a(8) =240a(9) =504a(10) =990a(11) =2046a(12) =4020a(13) =8190a(14) =16254a(15) =32730a(16) =65280a(17) =131070a(18) =261576a(19) =524286a(20) =1047540a(21) =2097018a(22) =4192254a(23) =8388606a(24) =16772880a(25) =33554400a(26) =67100670a(27) =134217216a(28) =268419060a(29) =536870910

External references