Number of 6-bead necklaces labeled with numbers -n..n not allowing reversal, with sum zero with no three beads in a row equal.

A208948

Number of 6-bead necklaces labeled with numbers -n..n not allowing reversal, with sum zero with no three beads in a row equal.

Terms

    a(0) =20a(1) =264a(2) =1464a(3) =5238a(4) =14430a(5) =33468a(6) =68722a(7) =128844a(8) =225126a(9) =371858a(10) =586668a(11) =890880a(12) =1309872a(13) =1873416a(14) =2616036a(15) =3577366a(16) =4802490a(17) =6342300a(18) =8253854a(19) =10600716a(20) =13453314a(21) =16889298a(22) =20993880a(23) =25860192a(24) =31589644a(25) =38292264a(26) =46087056a(27) =55102358

External references