Number of 6-bead necklaces labeled with numbers -n..n not allowing reversal, with sum zero and avoiding the pattern z z+1 z+2.

A209075

Number of 6-bead necklaces labeled with numbers -n..n not allowing reversal, with sum zero and avoiding the pattern z z+1 z+2.

Terms

    a(0) =19a(1) =265a(2) =1465a(3) =5239a(4) =14431a(5) =33469a(6) =68723a(7) =128845a(8) =225127a(9) =371859a(10) =586669a(11) =890881a(12) =1309873a(13) =1873417a(14) =2616037a(15) =3577367a(16) =4802491a(17) =6342301a(18) =8253855a(19) =10600717a(20) =13453315a(21) =16889299a(22) =20993881a(23) =25860193a(24) =31589645a(25) =38292265a(26) =46087057a(27) =55102359

External references