Number of 4-bead necklaces labeled with numbers -n..n not allowing reversal, with sum zero with no three beads in a row equal.

A208946

Number of 4-bead necklaces labeled with numbers -n..n not allowing reversal, with sum zero with no three beads in a row equal.

Terms

    a(0) =5a(1) =22a(2) =57a(3) =122a(4) =223a(5) =366a(6) =563a(7) =820a(8) =1143a(9) =1544a(10) =2029a(11) =2604a(12) =3281a(13) =4066a(14) =4965a(15) =5990a(16) =7147a(17) =8442a(18) =9887a(19) =11488a(20) =13251a(21) =15188a(22) =17305a(23) =19608a(24) =22109a(25) =24814a(26) =27729a(27) =30866a(28) =34231a(29) =37830

External references