Number of imprimitive (periodic) 2n-bead black-white reversible complementable necklaces with n black beads.
A115124
Number of imprimitive (periodic) 2n-bead black-white reversible complementable necklaces with n black beads.
Terms
- a(0) =0a(1) =0a(2) =1a(3) =1a(4) =2a(5) =1a(6) =4a(7) =1a(8) =7a(9) =3a(10) =14a(11) =1a(12) =40a(13) =1a(14) =86a(15) =15a(16) =257a(17) =1a(18) =797a(19) =1a(20) =2523a(21) =87a(22) =8360a(23) =1a(24) =29218a(25) =13a(26) =101341a(27) =765a(28) =361275a(29) =1
External references
- oeis: A115124