Number of dissimilar ternary squarefree words of length n+1.

Terms

a(0) =1a(1) =2a(2) =3a(3) =5a(4) =7a(5) =10a(6) =13a(7) =18a(8) =24a(9) =34a(10) =44a(11) =57a(12) =76a(13) =103a(14) =133a(15) =174a(16) =232a(17) =305a(18) =398a(19) =530a(20) =691a(21) =903a(22) =1172a(23) =1533a(24) =1982a(25) =2581a(26) =3370a(27) =4404a(28) =5737a(29) =7477