Number of 5-bead necklaces labeled with numbers -n..n allowing reversal, with sum zero and first differences in -n..n.
A209033
Number of 5-bead necklaces labeled with numbers -n..n allowing reversal, with sum zero and first differences in -n..n.
Terms
- a(0) =2a(1) =11a(2) =34a(3) =88a(4) =187a(5) =358a(6) =625a(7) =1023a(8) =1584a(9) =2355a(10) =3374a(11) =4700a(12) =6377a(13) =8476a(14) =11049a(15) =14175a(16) =17916a(17) =22361a(18) =27580a(19) =33672a(20) =40713a(21) =48816a(22) =58063a(23) =68577a(24) =80448a(25) =93809a(26) =108760a(27) =125442a(28) =143963a(29) =164476
External references
- oeis: A209033