The OEIS is supported by the many generous donors to the OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A351364 Number of necklaces with n black and n white beads that avoid the pattern BBBB. 1
 1, 2, 4, 9, 21, 59, 162, 483, 1453, 4492, 14048, 44616, 142936, 462380, 1506534, 4941955, 16303783, 54066560, 180111432, 602481589, 2022797529, 6814336663, 23026359634, 78027238290, 265085903996, 902733374480, 3080967048004, 10536594982790, 36102498293396, 123920278459564 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS Table of n, a(n) for n=1..30. Marko R. Riedel et al., Necklaces made of black and white beads, Math StackExchange, Feb 2022. FORMULA a(n) = A003239(n) - A351363(n). CROSSREFS Cf. A351359, A351357, A351358, A351359, A351360, A351361. Sequence in context: A123458 A048194 A148075 * A058718 A148076 A217976 Adjacent sequences: A351361 A351362 A351363 * A351365 A351366 A351367 KEYWORD nonn AUTHOR Marko Riedel, Feb 08 2022 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified February 21 20:41 EST 2024. Contains 370237 sequences. (Running on oeis4.)