Number of n-bead necklaces labeled with numbers -3..3 not allowing reversal, with sum zero and avoiding the pattern z z+1 z+2.
A209068
Number of n-bead necklaces labeled with numbers -3..3 not allowing reversal, with sum zero and avoiding the pattern z z+1 z+2.
Terms
- a(0) =1a(1) =4a(2) =12a(3) =57a(4) =276a(5) =1465a(6) =8008a(7) =45408a(8) =263168a(9) =1554582a(10) =9318412a(11) =56549840a(12) =346717662a(13) =2144555617a(14) =13365472929a(15) =83848948043a(16) =529091046781
External references
- oeis: A209068