Number of 5-bead necklaces labeled with numbers -n..n allowing reversal, with sum zero and first and second differences in -n..n.
A208972
Number of 5-bead necklaces labeled with numbers -n..n allowing reversal, with sum zero and first and second differences in -n..n.
Terms
- a(0) =1a(1) =3a(2) =9a(3) =19a(4) =40a(5) =77a(6) =130a(7) =213a(8) =325a(9) =484a(10) =687a(11) =956a(12) =1294a(13) =1715a(14) =2233a(15) =2863a(16) =3612a(17) =4508a(18) =5551a(19) =6779a(20) =8186a(21) =9814a(22) =11667a(23) =13773a(24) =16153a(25) =18832a(26) =21824a(27) =25171a(28) =28874a(29) =32991
External references
- oeis: A208972