Number of n-bead necklaces labeled with numbers -7..7 not allowing reversal, with sum zero and three times sum of squares <= n*(7)*(7+1).
A208813
Number of n-bead necklaces labeled with numbers -7..7 not allowing reversal, with sum zero and three times sum of squares <= n*(7)*(7+1).
Terms
- a(0) =1a(1) =5a(2) =37a(3) =355a(4) =3595a(5) =41962a(6) =486633a(7) =5896400a(8) =75009913a(9) =947911584a(10) =12153660815a(11) =161974729738
External references
- oeis: A208813