Number of primitive (period n) bracelets using exactly four different colored beads.

A056350

Number of primitive (period n) bracelets using exactly four different colored beads.

Terms

    a(0) =0a(1) =0a(2) =0a(3) =3a(4) =24a(5) =136a(6) =612a(7) =2616a(8) =10480a(9) =41364a(10) =159780a(11) =613919a(12) =2341920a(13) =8919204a(14) =33905164a(15) =128904660a(16) =490213680a(17) =1866117224a(18) =7111777860a(19) =27140327757a(20) =103721217388a(21) =396974621676

External references