Number of n-bead necklaces labeled with numbers -4..4 not allowing reversal, with sum zero and first and second differences in -4..4.

A209003

Number of n-bead necklaces labeled with numbers -4..4 not allowing reversal, with sum zero and first and second differences in -4..4.

Terms

    a(0) =1a(1) =2a(2) =3a(3) =10a(4) =31a(5) =153a(6) =703a(7) =3393a(8) =16001a(9) =75381a(10) =357369a(11) =1713043a(12) =8299559a(13) =40613618a(14) =200412275a(15) =995895544

External references