Number of bracelets of length n using exactly four different colored beads.

A056344

Number of bracelets of length n using exactly four different colored beads.

Terms

    a(0) =0a(1) =0a(2) =0a(3) =3a(4) =24a(5) =136a(6) =612a(7) =2619a(8) =10480a(9) =41388a(10) =159780a(11) =614058a(12) =2341920a(13) =8919816a(14) =33905188a(15) =128907279a(16) =490213680a(17) =1866127840a(18) =7111777860a(19) =27140369148a(20) =103721218000a(21) =396974781456

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