Number of primitive (period n) n-bead bracelet structures which are not periodic palindromes using a maximum of three different colored beads.

A328657

Number of primitive (period n) n-bead bracelet structures which are not periodic palindromes using a maximum of three different colored beads.

Terms

    a(0) =0a(1) =0a(2) =1a(3) =1a(4) =4a(5) =9a(6) =26a(7) =66a(8) =183a(9) =488a(10) =1342a(11) =3690a(12) =10220a(13) =28470a(14) =79720a(15) =224230a(16) =633040a(17) =1793727a(18) =5097638a(19) =14528640a(20) =41509364a(21) =118868750a(22) =341098474a(23) =980661510a(24) =2824295364a(25) =8147015352a(26) =23535794889a(27) =68085719208a(28) =197213728060a(29) =571919889400

External references