Number of n-bead necklaces labeled with numbers -3..3 not allowing reversal, with sum zero and first and second differences in -3..3.

A209002

Number of n-bead necklaces labeled with numbers -3..3 not allowing reversal, with sum zero and first and second differences in -3..3.

Terms

    a(0) =1a(1) =1a(2) =3a(3) =5a(4) =13a(5) =46a(6) =157a(7) =608a(8) =2245a(9) =8184a(10) =30309a(11) =113476a(12) =428729a(13) =1637809a(14) =6309489a(15) =24478530a(16) =95532067a(17) =374703951

External references