Number of 6-bead necklaces labeled with numbers -n..n not allowing reversal, with sum zero and first differences in -n..n.

A208997

Number of 6-bead necklaces labeled with numbers -n..n not allowing reversal, with sum zero and first differences in -n..n.

Terms

    a(0) =5a(1) =51a(2) =253a(3) =874a(4) =2354a(5) =5404a(6) =11010a(7) =20553a(8) =35781a(9) =58971a(10) =92851a(11) =140818a(12) =206798a(13) =295528a(14) =412352a(15) =563577a(16) =756175a(17) =998245a(18) =1298615a(19) =1667392a(20) =2115476a(21) =2655216a(22) =3299792a(23) =4064019a(24) =4963585a(25) =6015983a(26) =7239629a(27) =8654930a(28) =10283232a(29) =12148080

External references