Number of n-bead necklaces labeled with numbers -6..6 not allowing reversal, with sum zero and avoiding the patterns z z+1 z+2 and z z-1 z-2.
A209113
Number of n-bead necklaces labeled with numbers -6..6 not allowing reversal, with sum zero and avoiding the patterns z z+1 z+2 and z z-1 z-2.
Terms
- a(0) =1a(1) =7a(2) =41a(3) =362a(4) =3325a(5) =32802a(6) =336055a(7) =3552027a(8) =38413793a(9) =423087907a(10) =4729090301a(11) =53509230007
External references
- oeis: A209113