Number of 5-bead necklaces labeled with numbers -n..n allowing reversal, with sum zero and avoiding the patterns z z+1 z+2 and z z-1 z-2.

A209486

Number of 5-bead necklaces labeled with numbers -n..n allowing reversal, with sum zero and avoiding the patterns z z+1 z+2 and z z-1 z-2.

Terms

    a(0) =4a(1) =38a(2) =140a(3) =390a(4) =866a(5) =1702a(6) =3014a(7) =4984a(8) =7774a(9) =11620a(10) =16716a(11) =23352a(12) =31768a(13) =42302a(14) =55232a(15) =70950a(16) =89774a(17) =112150a(18) =138434a(19) =169120a(20) =204610a(21) =245452a(22) =292080a(23) =345096a(24) =404980a(25) =472382a(26) =547820a(27) =631998a(28) =725474a(29) =829006

External references