Number of 5-bead necklaces labeled with numbers -n..n allowing reversal, with sum zero with no three beads in a row equal.

A209346

Number of 5-bead necklaces labeled with numbers -n..n allowing reversal, with sum zero with no three beads in a row equal.

Terms

    a(0) =5a(1) =40a(2) =145a(3) =400a(4) =883a(5) =1724a(6) =3045a(7) =5026a(8) =7827a(9) =11684a(10) =16795a(11) =23446a(12) =31879a(13) =42430a(14) =55379a(15) =71118a(16) =89965a(17) =112362a(18) =138671a(19) =169384a(20) =204901a(21) =245770a(22) =292429a(23) =345476a(24) =405393a(25) =472828a(26) =548301a(27) =632516a(28) =726031a(29) =829600

External references