Number of binary words of length n that avoid abelian 4th powers circularly.

Terms

a(0) =2a(1) =2a(2) =6a(3) =8a(4) =10a(5) =6a(6) =28a(7) =0a(8) =36a(9) =120a(10) =132a(11) =168a(12) =364a(13) =112a(14) =390a(15) =32a(16) =374a(17) =396a(18) =114a(19) =280a(20) =756a(21) =462a(22) =92a(23) =1584a(24) =1100a(25) =910a(26) =2484a(27) =2352a(28) =3016a(29) =3270