Number of n-bead necklace structures which are not self-equivalent under a nonzero rotation using a maximum of three different colored beads.

A328742

Number of n-bead necklace structures which are not self-equivalent under a nonzero rotation using a maximum of three different colored beads.

Terms

    a(0) =1a(1) =1a(2) =0a(3) =1a(4) =2a(5) =8a(6) =17a(7) =52a(8) =130a(9) =363a(10) =968a(11) =2684a(12) =7338a(13) =20440a(14) =56836a(15) =159424a(16) =448130a(17) =1266080a(18) =3586479a(19) =10195276a(20) =29054568a(21) =83018624a(22) =237729932a(23) =682196948a(24) =1961301330a(25) =5648590728a(26) =16293970840a(27) =47071589049a(28) =136171269780a(29) =394427456120

External references