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

A208823

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

Terms

    a(0) =1a(1) =7a(2) =25a(3) =210a(4) =1755a(5) =17339a(6) =177097a(7) =1888153a(8) =20587627a(9) =228891069a(10) =2582512649a(11) =29499246456

External references