Number of length-n binary words that can be written as the concatenation of two unbordered binary words.

A306742

Number of length-n binary words that can be written as the concatenation of two unbordered binary words.

Terms

    a(0) =0a(1) =4a(2) =6a(3) =14a(4) =26a(5) =54a(6) =104a(7) =210a(8) =412a(9) =832a(10) =1654a(11) =3330a(12) =6670a(13) =13452a(14) =27004a(15) =54414a(16) =109400a(17) =220264a(18) =442938a(19) =891256a(20) =1791894a(21) =3603128a(22) =7241452a(23) =14552628a(24) =29234478a(25) =58720290a(26) =117911510a(27) =236729446a(28) =475169660a(29) =953616548

External references