Number of 6-bead necklaces labeled with numbers -n..n not allowing reversal, with sum zero and first and second differences in -n..n.
A209010
Number of 6-bead necklaces labeled with numbers -n..n not allowing reversal, with sum zero and first and second differences in -n..n.
Terms
- a(0) =2a(1) =10a(2) =46a(3) =153a(4) =409a(5) =923a(6) =1854a(7) =3477a(8) =6034a(9) =9876a(10) =15590a(11) =23625a(12) =34577a(13) =49487a(14) =69002a(15) =94129a(16) =126458a(17) =166848a(18) =216732a(19) =278575a(20) =353347a(21) =442987a(22) =550942a(23) =678467a(24) =827960a(25) =1004068a(26) =1208150a(27) =1443457a(28) =1715865a(29) =2026795
External references
- oeis: A209010