Number of 4-bead necklaces labeled with numbers -n..n not allowing reversal, with sum zero and first differences in -n..n.

A208995

Number of 4-bead necklaces labeled with numbers -n..n not allowing reversal, with sum zero and first differences in -n..n.

Terms

    a(0) =2a(1) =7a(2) =16a(3) =33a(4) =58a(5) =95a(6) =144a(7) =209a(8) =290a(9) =391a(10) =512a(11) =657a(12) =826a(13) =1023a(14) =1248a(15) =1505a(16) =1794a(17) =2119a(18) =2480a(19) =2881a(20) =3322a(21) =3807a(22) =4336a(23) =4913a(24) =5538a(25) =6215a(26) =6944a(27) =7729a(28) =8570a(29) =9471

External references