This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A351364 #9 Mar 13 2022 19:32:29 %S A351364 1,2,4,9,21,59,162,483,1453,4492,14048,44616,142936,462380,1506534, %T A351364 4941955,16303783,54066560,180111432,602481589,2022797529,6814336663, %U A351364 23026359634,78027238290,265085903996,902733374480,3080967048004,10536594982790,36102498293396,123920278459564 %N A351364 Number of necklaces with n black and n white beads that avoid the pattern BBBB. %H A351364 Marko R. Riedel et al., <a href="https://math.stackexchange.com/questions/4376420/">Necklaces made of black and white beads</a>, Math StackExchange, Feb 2022. %F A351364 a(n) = A003239(n) - A351363(n). %Y A351364 Cf. A351359, A351357, A351358, A351359, A351360, A351361. %K A351364 nonn %O A351364 1,2 %A A351364 _Marko Riedel_, Feb 08 2022