Number of n-bead necklaces labeled with numbers -3..3 not allowing reversal, with sum zero with no three beads in a row equal.
A208940
Number of n-bead necklaces labeled with numbers -3..3 not allowing reversal, with sum zero with no three beads in a row equal.
Terms
- a(0) =1a(1) =4a(2) =12a(3) =57a(4) =274a(5) =1464a(6) =7974a(7) =45050a(8) =260046a(9) =1529746a(10) =9129838a(11) =55159410a(12) =336661016a(13) =2072786142a(14) =12858170994a(15) =80288297320a(16) =504231724034
External references
- oeis: A208940