Number of 6-bead necklaces labeled with numbers -n..n allowing reversal, with sum zero and first differences in -n..n.

A209034

Number of 6-bead necklaces labeled with numbers -n..n allowing reversal, with sum zero and first differences in -n..n.

Terms

    a(0) =4a(1) =33a(2) =144a(3) =471a(4) =1237a(5) =2798a(6) =5648a(7) =10483a(8) =18174a(9) =29863a(10) =46918a(11) =71037a(12) =104183a(13) =148732a(14) =207352a(15) =283199a(16) =379766a(17) =501099a(18) =651612a(19) =836369a(20) =1060813a(21) =1331122a(22) =1653894a(23) =2036531a(24) =2486878a(25) =3013693a(26) =3626176a(27) =4334533a(28) =5149447a(29) =6082684

External references