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

A328743

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

Terms

    a(0) =1a(1) =1a(2) =0a(3) =1a(4) =2a(5) =10a(6) =26a(7) =102a(8) =336a(9) =1225a(10) =4352a(11) =15934a(12) =58190a(13) =215250a(14) =798720a(15) =2983136a(16) =11184128a(17) =42109450a(18) =159070352a(19) =602809326a(20) =2290640486a(21) =8726307432a(22) =33318502400a(23) =127479700198a(24) =488671717040

External references