Number of (0, 1)-necklaces with n zeros and n ones without zigzags (see reference for precise definition).
A263658
Number of (0, 1)-necklaces with n zeros and n ones without zigzags (see reference for precise definition).
Terms
- a(0) =0a(1) =0a(2) =1a(3) =1a(4) =2a(5) =3a(6) =7a(7) =12a(8) =27a(9) =57a(10) =128a(11) =285a(12) =659a(13) =1518a(14) =3561a(15) =8389a(16) =19936a(17) =47607a(18) =114397a(19) =276018a(20) =669035a(21) =1627491a(22) =3973106a(23) =9728991a(24) =23892779a(25) =58828866a(26) =145201423a(27) =359182693a(28) =890350290a(29) =2211257973
External references
- oeis: A263658