Number of 7-bead necklaces labeled with numbers -n..n allowing reversal, with sum zero with no three beads in a row equal.

A209348

Number of 7-bead necklaces labeled with numbers -n..n allowing reversal, with sum zero with no three beads in a row equal.

Terms

    a(0) =21a(1) =514a(2) =4029a(3) =18646a(4) =62853a(5) =172610a(6) =409199a(7) =870122a(8) =1699831a(9) =3104474a(10) =5365417a(11) =8858142a(12) =14068115a(13) =21614144a(14) =32266607a(15) =46975088a(16) =66888951a(17) =93389664a(18) =128113109a(19) =172986976a(20) =230254897a(21) =302518564a(22) =392763779a(23) =504407780a(24) =641326401a(25) =807907094

External references