Number of 5-bead necklaces labeled with numbers -n..n not allowing reversal, with sum zero and first and second differences in -n..n.
A209009
Number of 5-bead necklaces labeled with numbers -n..n not allowing reversal, with sum zero and first and second differences in -n..n.
Terms
- a(0) =1a(1) =5a(2) =13a(3) =31a(4) =71a(5) =137a(6) =243a(7) =399a(8) =619a(9) =927a(10) =1329a(11) =1857a(12) =2525a(13) =3355a(14) =4385a(15) =5627a(16) =7121a(17) =8893a(18) =10971a(19) =13407a(20) =16213a(21) =19449a(22) =23143a(23) =27333a(24) =32083a(25) =37413a(26) =43389a(27) =50053a(28) =57447a(29) =65651
External references
- oeis: A209009