Number of 7-bead necklaces labeled with numbers -n..n not allowing reversal, with sum zero and avoiding the patterns z z+1 z+2 and z z-1 z-2.
A209119
Number of 7-bead necklaces labeled with numbers -n..n not allowing reversal, with sum zero and avoiding the patterns z z+1 z+2 and z z-1 z-2.
Terms
- a(0) =25a(1) =865a(2) =7377a(3) =35253a(4) =121117a(5) =336055a(6) =802125a(7) =1712987a(8) =3357255a(9) =6145113a(10) =10639105a(11) =17587647a(12) =27961449a(13) =42994779a(14) =64228807a(15) =93558167a(16) =133282385a(17) =186159325a(18) =255461573a(19) =345038397a(20) =459378989a(21) =603678961a(22) =783912475a(23) =1006905635a(24) =1280412799
External references
- oeis: A209119