Number of words of length n (n >= 1) over a two-letter alphabet having a minimal period of size n-2.

A019311

Number of words of length n (n >= 1) over a two-letter alphabet having a minimal period of size n-2.

Terms

    a(0) =0a(1) =0a(2) =2a(3) =2a(4) =6a(5) =12a(6) =28a(7) =48a(8) =106a(9) =198a(10) =414a(11) =800a(12) =1644a(13) =3236a(14) =6546a(15) =12982a(16) =26130a(17) =52048a(18) =104404a(19) =208372a(20) =417390a(21) =833930a(22) =1669102a(23) =3336476a(24) =6675512a(25) =13347600a(26) =26700226a(27) =53393562a(28) =106797302a(29) =213580904

External references