Number of n-bead necklace structures with no adjacent elements having the same color.

A328150

Number of n-bead necklace structures with no adjacent elements having the same color.

Terms

    a(0) =1a(1) =0a(2) =1a(3) =1a(4) =3a(5) =3a(6) =12a(7) =24a(8) =103a(9) =387a(10) =1819a(11) =8933a(12) =48632a(13) =279484a(14) =1716523a(15) =11126025a(16) =76014437a(17) =544945399a(18) =4089010392a(19) =32025053060a(20) =261213946739

External references