Number of n-bead necklaces labeled with numbers -3..3 not allowing reversal, with sum zero and three times sum of squares <= n*(3)*(3+1).
A208809
Number of n-bead necklaces labeled with numbers -3..3 not allowing reversal, with sum zero and three times sum of squares <= n*(3)*(3+1).
Terms
- a(0) =1a(1) =3a(2) =7a(3) =37a(4) =185a(5) =982a(6) =5491a(7) =30634a(8) =177213a(9) =1046962a(10) =6298375a(11) =38673066a(12) =239176117a(13) =1493154690a(14) =9380538425a(15) =59332570286a(16) =377865591909
External references
- oeis: A208809