Number of n-bead necklaces labeled with numbers -7..7 allowing reversal, with sum zero and three times sum of squares <= n*(7)*(7+1).
A208804
Number of n-bead necklaces labeled with numbers -7..7 allowing reversal, with sum zero and three times sum of squares <= n*(7)*(7+1).
Terms
- a(0) =1a(1) =5a(2) =22a(3) =201a(4) =1827a(5) =21227a(6) =243678a(7) =2951235a(8) =37509753a(9) =473996108a(10) =6076893848a(11) =80987915371
External references
- oeis: A208804