Number of 4-bead necklaces labeled with numbers -n..n allowing reversal, with sum zero with no three beads in a row equal.

A209345

Number of 4-bead necklaces labeled with numbers -n..n allowing reversal, with sum zero with no three beads in a row equal.

Terms

    a(0) =4a(1) =15a(2) =35a(3) =72a(4) =128a(5) =205a(6) =311a(7) =448a(8) =618a(9) =829a(10) =1083a(11) =1382a(12) =1734a(13) =2141a(14) =2605a(15) =3134a(16) =3730a(17) =4395a(18) =5137a(19) =5958a(20) =6860a(21) =7851a(22) =8933a(23) =10108a(24) =11384a(25) =12763a(26) =14247a(27) =15844a(28) =17556a(29) =19385

External references