Number of primitive (period n) n-bead necklace structures using exactly five different colored beads.

A056306

Number of primitive (period n) n-bead necklace structures using exactly five different colored beads.

Terms

    a(0) =0a(1) =0a(2) =0a(3) =0a(4) =1a(5) =3a(6) =20a(7) =136a(8) =773a(9) =4280a(10) =22430a(11) =115097a(12) =577577a(13) =2863207a(14) =14051163a(15) =68515378a(16) =332514803a(17) =1608799915a(18) =7767857090a(19) =37460384315a(20) =180536313527a(21) =869901375049

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