Number of self-dual cyclic n-color compositions.

Terms

a(0) =1a(1) =1a(2) =2a(3) =1a(4) =3a(5) =2a(6) =5a(7) =1a(8) =10a(9) =3a(10) =19a(11) =2a(12) =41a(13) =5a(14) =94a(15) =1a(16) =211a(17) =10a(18) =493a(19) =3a(20) =1170a(21) =19a(22) =2787a(23) =2a(24) =6713a(25) =41a(26) =16274a(27) =5a(28) =39651a(29) =94